3/4 + 5/6
7/6 - 5/9
6/25 x 15/8
24/35 : 15/7
NN
Những câu hỏi liên quan
a) x - = b) . c)
) : e) f) .
x
x
d x x x x x
3 13 2 4 3 7 2
1 3
5 25 3 5 10 15 3
4 5 1 7 2 11 1 1
3 15 1 3
5 7 6 5 5 2 3 2
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câu 6 : tính a) 3/5 + 1/3 b) 17/20 - 4/5 c) 25/35 x 4/5 d) 7/15 : 6/7
\(a\) \(\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{9}{15}+\dfrac{5}{15}=\dfrac{14}{15}\)
\(b\) \(\dfrac{17}{20}-\dfrac{4}{5}=\dfrac{17}{20}-\dfrac{16}{20}-\dfrac{1}{20}\)
\(c\) \(\dfrac{25}{35}\times\dfrac{4}{5}=\dfrac{5}{7}\times\dfrac{4}{5}=\dfrac{4}{7}\)
\(d\) \(\dfrac{7}{15}:\dfrac{6}{7}=\dfrac{7}{15}\times\dfrac{7}{6}=\dfrac{49}{90}\)
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a)(5+1/5-2/9)-(2-1/23-3/35+5/6)-(8+2/7-1/18)
b) 1/3-3/4(-3/5+1/64- -2/9-1/36+1/15
c) -5/7-(-5/67)+13/10+1/2+(-1/6)+1 3/14-(-2/5)
d)3/5:(-1/15-1/6)+3/5:(-1/3-1 1/15)
4/7 + 2/3
5/6 - 3/4
3/10 x 15/6
7/6 : 5/4
`4/7 + 2/3 = 12/21 + 14/21 = 26/21`
`5/6 -3/4 = 10/12 - 9/12 = 1/12`
`3/10 xx 15/6 = 3/10 xx 5/2 = 3/4`
`7/6 : 5/4 = 7/6 xx 4/5 = 14/15`
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`4/7 + 2/3 `
`=12/21 + 14/21`
`=28/21`
`5/6 - 3/4 `
`=20/24 - 18/24`
`=2/24`
`3/10 x 15/6`
`=3/4`
`7/6 : 5/4`
`=7/6 xx 4/5`
`=14/15`
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`4/7 + 2/3= 12/21 + 14/21= 26/21`
`5/6-3/4=20/24 - 18/24=2/24=1/12`
`3/10 xx 15/6= (3xx15)/(10xx6)=45/60=3/4`
`7/6 : 5/4= 7/6 xx 4/5= 28/30=14/15`
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tính nhanh
3) 14.35.5+10.25.7+20.7
4) 15(27+18+6)+ 15(23.12)
5) 24(15+49)+12(50+42)
6) 10(81+19)+100+50(91+9)
7) 53(51+4)+53(49+96)+53
8)42(15+96)+6(25+4).7
9) 45(13+78)+9(87+22).5
10) 16(27+75)+8(53+25).2
giúp mik nhé các bạn mong các bạn giúp đỡ
5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
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7) 53*( 51+4)+53*(49+96)+53
=53*55+53*145+53
=53*(55+145)+53
=53*200+53
10600+53
=10653
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1. -2/9 x 15/17 + -2/9 x 2/17
2. -5/3 x 6/5 + -7/9 x 3/10
3. 15/20 x 7/5 + -9/7 x -6/4
4.-25/13 x 5/19 + -25/13 x 14/19
5 -7/13 x 13/5 + -9/7 x 5/3
6. 27/35 x 5/9 - 2/7 x -7/5
7. 10/13 x 13/5 + {-9/5} x 10/3
8. 100/27 x 9/20 + 40% x 5/3
9. 1,5 x 5/12 + 1/4 x 3/4
10. 2 1/2 x 7/5 + {-9/10} x 2/3
11. X + 45% = 2 1/2 -5/3
12. 80% + X = -5/2 + 3/4
13. 4/25 - X =-5/2 + -3/10
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
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1: =-2/9(15/17+2/17)=-2/9
2: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
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1. 27/5 x 91/12 x 125/9 x 96/13
2. 2539/35 x 7/90 + 561/35 x 7/90
3. 31/7 : (2/5 x 31/7)
4. (29 x 15/23 x 36/29) : 5/23
5. 4/3 x 5/4 x 6/5 x ... x 12/11
6. 34/11 x 27/46 x 23/17 x 22/9
7. 4/3 x 9/8 x 16/15 x 25/24 x ... x 100/99
a)\(\frac{27}{5}\text{x}\frac{91}{12}\text{x}\frac{125}{9}\text{x}\frac{96}{13}=\frac{27}{9}\text{x}\frac{91}{13}\text{x}\frac{125}{5}\text{x}\frac{96}{12}=3\text{x}7\text{x}25\text{x}8\)
Đến đây tự tính nha !
b)\(\frac{2539}{35}\text{x}\frac{7}{90}+\frac{561}{35}\text{x}\frac{7}{90}=\frac{7}{90}\text{x}\left(\frac{2539}{35}+\frac{561}{35}\right)=\frac{7}{90}\text{x}\frac{3100}{35}=\frac{3100}{90}\text{x}\frac{7}{35}=\frac{310}{9}\text{x}\frac{1}{5}=\frac{62}{9}\)
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1. 27/5 x 91/12 x 125/9 x 96/13
2. 2539/35 x 7/90 + 561/35 x 7/90
3. 31/7 : (2/5 x 31/7)
4. (29 x 15/23 x 36/29) : 5/23
3)\(\dfrac{31}{7}\) : (\(\dfrac{2}{5}\times\dfrac{31}{7}\) )
=\(\dfrac{31}{7}\) : \(\dfrac{2}{5}\times\dfrac{31}{7}\)
= \(\dfrac{31}{7}:\dfrac{31}{7}\times\dfrac{2}{5}\)
= \(\dfrac{2}{5}\)
4) (\(29\times\dfrac{15}{23}\times\dfrac{31}{7}\)) : \(\dfrac{5}{23}\)
=\(29\times\dfrac{15}{23}\times\dfrac{31}{7}:\dfrac{5}{23}\)
= \(29\times\dfrac{31}{7}\times\dfrac{15}{23}:\dfrac{5}{23}\)
= 29 x \(\dfrac{31}{7}\times\dfrac{15}{23}\times\dfrac{23}{5}\)
= 29 x \(\dfrac{31}{7}\times3\)
= 29 x 3 x \(\dfrac{31}{7}\)
= 87 x \(\dfrac{31}{7}\)
= \(\dfrac{2697}{7}\)
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Tính theo mẫu :
32 dam x 3 = 96dam
25 m x 2 =
15 km x 4 =
34 cm x 6 =
96 cam : 3 = 32 cm.
36 hm : 3 =
70 km : 7 =
55 dm : 5 =
25 m x 2 = 50 m
15 km x 4 = 60 km
34 cm x 6 = 204 cm
36 hm : 3 = 12 hm
70 km : 7 = 10 km
55 dm : 5 = 11dm
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25m x2 =50 m
15km x4 =60 km
34 cm x6= 204cm
96cm :3 =32 cm
36hm :3 =12 hm
70km :7 =10 km
55dm :5 =11 dm
25 m x 2= 50 m
15 km x 4 = 60 km
34 cm x 6 = 204 cm
36 hm : 3 = 12 hm
70 km : 7 = 10 km
55 dm : 5 = 11dm
1 . Tính nhanh
a/ 15 . ( 27 + 18 + 6 ) + 15 . ( 23 + 12 )
b/ 14 . 35 . 5 + 10 . 25 .7 + 20 . 70
c/ 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53
d/ 46 . ( 27 + 75 ) + 8 . ( 58 + 25 ) . 2
a) 15 . (27 + 18 + 6 ) + 15 . ( 23 +12 ) = 15. 51 + 15 . 35 = 765 + 525 = 1290
b) 14 . 35 . 5 + 10 . 25 . 7 + 20 . 70 = 2450 + 1750 + 1400 = 2452450
c) 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53 = 53 . 55 + 53 . 145 + 53 = 2915 . 7685 = 22401775
d) 46 . ( 27 +75 ) +8 . ( 58 + 25 ) + 8 . ( 58 + 25 ) . 2 = 46 . 102 + 8 . 83 + 8 . 83 = 4692 + 664 + 664 = 6020
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Tính nhanh:3/15+4/20+5/25-6/30-7/35-8/40
\(=\dfrac{1}{5}+\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{5}-\dfrac{1}{5}-\dfrac{1}{5}=0\)
( chỉ cần rút gọn đến phân số tối giản của từng số là sẽ ra )
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