38/75 ÷ 19/25 + 81/25 + 4. 2/7
H24
Những câu hỏi liên quan
\(\dfrac{38}{75}\)÷\(\dfrac{19}{25}\)+\(\dfrac{81}{25}\)+ 4.\(\dfrac{2}{7}\)
`35/75 : 19/25 + 81/25 + 4.2/7`
=`38/75 xx 25/18 + 81/25 + 8/7`
=` 2/3 + 81/25 + 8/7`
= `293/75 + 8/7`
= `2651/525`
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1 viết các số thập phân sau dưới dạng phân số tối giản:
4,(75)
-6,(81)
8,24(25)
7,(8182)
0,(8)
1,(25)
-2,(38)
15*37*4+120*21+21*5*12
15*(27+18+6)+15*(23+12)
10*(81+19)+100+50*(91+9)
42*(15+96)+6*(25+4)*7
16*(27+75)+8*(53+25)*2
A.(13 9/11 : 38/49 - 5 5/11 : 38/49): (49/38•5/11)
B.39 124/173•95 4/23 + 75 49/173•18/23-39 124/173•94 9/23
C.(7/12+1 25/31)•19 3/8 - 7 1/12 • 7 3/8
D.17/35•37 19/25 + 1 8/17 • 33 7/25 +(17/35-1 8/17)•32 6/25
Mong mọi người giúp mình các bài này.Mai phải nộp bài gấp
mình còn ko bt cơ mà mai nộp r
mik chỉ lm đc 1 câu thôi mong bn like cho
(13911:3849−5211:3849):(4938.511)={(13+911).4938−(5+211).4938}:(4938.511)=4938.(13−5+911−211):(4938.511)=4938.(8+711):(4938.511)=(8+711):511=19
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Bài 442: Tính hợp lý:
1. 1/3 . 4/5 + 1/3 . 6/5 - 1/3
2. 3/7 . 9/26 - 1/14 . 1/13
3. 15(1/5 - 7/15 + 17/3)
4. 38(2và1/19 - 5và7/38)
5. 75( - 4/25 + 7và1/15 - 5và7/75)
\(1)\frac{1}{3}.\frac{4}{5}+\frac{1}{3}.\frac{6}{5}-\frac{1}{3}\)
\(=\frac{1}{3}\left(\frac{4}{5}+\frac{6}{5}\right)\)
\(=\frac{1}{3}.2\)
\(=\frac{2}{3}\)
\(1)\)\(\frac{1}{3}.\frac{4}{5}+\frac{1}{3}.\frac{6}{5}-\frac{1}{3}\)
\(=\frac{1}{3}.\left(\frac{4}{5}+\frac{6}{5}-1\right)\)
\(=\frac{1}{3}.\left(\frac{4}{5}+\frac{6}{5}-\frac{5}{5}\right)\)
\(=\frac{1}{3}.1\)
\(=\frac{1}{3}\)
\(2)\)\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}\)
\(=\frac{1}{7}.\frac{27}{26}-\frac{1}{7}.\frac{1}{26}\)
\(=\left(\frac{27}{26}-\frac{1}{26}\right).\frac{1}{7}\)
\(=1.\frac{1}{7}\)
\(=\frac{1}{7}\)
\(3)\)\(15\left(\frac{1}{5}-\frac{7}{15}+\frac{17}{3}\right)\)
\(=3-7+85\)
\(=81\)
\(4)\)\(38\left(2\frac{1}{19}-5\frac{7}{38}\right)\)
\(=38\left(\frac{39}{19}-\frac{197}{38}\right)\)
\(=78-197\)
\(=-119\)
\(5)\)\(75\left(\frac{-4}{25}+7\frac{1}{15}-5\frac{7}{75}\right)\)
\(=75\left(\frac{-4}{25}+\frac{106}{15}-\frac{382}{75}\right)\)
\(=-12+530-382\)
\(=136\)
Ddaeng
1, \(\frac{1}{3}.\frac{4}{5}+\frac{1}{3}.\frac{6}{5}-\frac{1}{3}\)
\(=\frac{1}{3}.\left(\frac{4}{5}+\frac{6}{5}\right)-\frac{1}{3}\)
\(=\frac{1}{3}.2-\frac{1}{3}\)
\(=\frac{2}{3}-\frac{1}{3}\)
\(=\frac{1}{3}\)
2, \(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}\)
\(=\frac{1}{7}.3.\frac{9}{26}-\frac{1}{7}.\frac{1}{2}.\frac{1}{13}\)
\(=\frac{1}{7}.\frac{27}{26}-\frac{1}{7}.\frac{1}{26}\)
\(=\frac{1}{7}.\left(\frac{27}{26}-\frac{1}{26}\right)\)
\(=\frac{1}{7}.1\)
\(=\frac{1}{7}\)
3, \(15.\left(\frac{1}{5}-\frac{7}{15}+\frac{17}{3}\right)\)
\(=15.\frac{1}{5}-15.\frac{7}{15}+15.\frac{17}{3}\)
\(=3-7+85\)
\(=81\)
4, \(38.\left(2\frac{1}{19}+5\frac{7}{38}\right)\)
\(=38.\left(\frac{39}{19}+\frac{197}{38}\right)\)
\(=38.\frac{39}{19}+38.\frac{197}{38}\)
\(=78+197\)
\(=275\)
5, \(75.\left(\frac{-4}{25}+7\frac{1}{15}-5\frac{7}{75}\right)\)
\(=75.\left(\frac{-4}{25}+\frac{106}{15}-\frac{382}{75}\right)\)
\(=75.\frac{-4}{25}+75.\frac{106}{15}-75.\frac{382}{75}\)
\(=-12+530-382\)
\(=136\)
1.Tính
\(\dfrac{38}{75}:\dfrac{19}{25}\)
\(\dfrac{38}{75}:\dfrac{19}{25}=\dfrac{38}{75}\times\dfrac{25}{19}=\dfrac{2}{3}\)
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Xem thêm câu trả lời
a, 5/11 + 1/2 + 2/5 + 6/11 + 3/4 + 16/25 + 5/16
b,19/4 + 37/100 + 1/8 + 132/25 + 5/2 + 37/12
c, 1313/1313 * 165165/143143 * 424242/151515
d, (121/122 * 123/125 + 127/129) * (1995/1996 * 17/16 - 21/25 : 16/17) * (42/30 * 75/23 - 19/23 * 210/38
b,19/4 + 37/100 + 1/8 + 132/25 + 5/2 + 37/12
c, 1313/1313 * 165165/143143 * 424242/151515
d, (121/122 * 123/125 + 127/129) * (1995/1996 * 17/16 - 21/25 : 16/17) * (42/30 * 75/23 - 19/23 * 210/38
b,19/4 + 37/100 + 1/8 + 132/25 + 5/2 + 37/12=37/15
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Bài 1: Tính nhanh
a, 5/11 + 1/2 + 2/5 + 6/11 + 3/4 + 16/25 + 5/16
b,19/4 + 37/100 + 1/8 + 132/25 + 5/2 + 37/12
c, 1313/1313 * 165165/143143 * 424242/151515
d, (121/122 * 123/125 + 127/129) * (1995/1996 * 17/16 - 21/25 : 16/17) * (42/30 * 75/23 - 19/23 * 210/38)