54+96+25+89=
24+59+641+59=
89 *16 - 89 * 25 +89 * 59
89 *16 - 89 * 25 +89 * 59
= 89 * (16 - 25 + 59)
= 89 * 50
= 98 * 100 : 2
= 9800 : 2
= 4900
89 *16 - 89 * 25 +89 * 59
=89*(16-25+59)
=89*50
=4450
khong lam phep tinh ,hay cho biet ket qua cua moi phep tinh sau co tan bang chu so nao ?giai thich tai sao?
a.2*4*6*8...*96*98*5
b.5*15*25*...*2025
c.59*69*79*89-21*41*61*81
d.4*14*24*...*2024
bài 1 : 101 x 125 + 101 x 25 - 101 x 50
bài 2 : 76 x 115 + 56 x 24 + 59 x 24
bài 3 : thực hiện phép tính : a ) 90-84+ 8 - 72 +66-60+54-48
b ) 99-97+95-93+91-89+.........+7-5+3-1
bài 4 : tìm số tự nhiên x biết :
a) \(x\) x 16 -\(x\) x 9 = 56
bài 5 :tìm số tự nhiên x , biết
a) \(x\) + 2 x \(x\) +3 x \(x\)+4 x \(x\) +5 x \(x\) = 165
b ) 1+2+3+4+.....+\(x\)=55
GIẢI GIÚP E Ạ
Bài 1:
\(101\cdot125+101\cdot25-101\cdot50\)
\(=101\cdot\left(125+25-50\right)\)
\(=101\cdot100\)
\(=10100\)
Bài 2:
\(76\cdot115+56\cdot24+59\cdot24\)
\(=76\cdot115+24\cdot\left(56+59\right)\)
\(=76\cdot115+24\cdot115\)
\(=115\cdot\left(76+24\right)\)
\(=115\cdot100\)
\(=11500\)
5:
a: =>15x=165
=>x=11
b: =>x(x+1)/2=55
=>x^2+x=110
=>x=10
4: =>7x=56
=>x=8
Bài 1:
101•125+101•25+101•50
= 101•(125+25-50)
=101•100
=10100
Bài 2:
76•115+56•24+59•24
= 76•115+24•(56+59)
= 76•115+24•115
= 115•(76+24)
= 115•100
= 11500
89 *16 - 89 * 25 + 89 * 59
89 x 16 - 89 x 25 + 89 x 59
= 89 x ( 16 - 25 + 59 )
= 89 x 50
= 4450
\(89.16-89.25+89.59\)
\(=89.\left(16-25+29\right)\)
\(=89.50\)
\(=4450\)
kick mk nha mk kick lại
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 27 * 28 * 29 * 30 * 31 * 32 * 33 * 34 * 35 * 36 * 37 * 38 * 39 * 40 * 41 * 42 * 43 * 44 * 45 * 46 * 47 * 48 * 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
59.(11-89)-89.(-59+11)
24) 15 (4-7)- 15 (5-3)
25) 73(8-59) -59(8-73)
\(\text{24) 15 (4-7)- 15 (5-3)}\)
\(=15.\left[\left(4-7\right)-\left(5-3\right)\right]\)
\(=15.\left[4-7-5+3\right]\)
\(=15.\left(-5\right)\)
\(=-75\)
\(\text{25) 73(8-59) -59(8-73)}\)
\(=73.8-73.59-59.8+59.73\)
\(=8\left(73-59\right)+59\left(-73+73\right)\)
\(=8.14+59.0\)
\(=112\)
24) 15 (4-7)- 15 (5-3)
=15. 4 − 7 − 5 − 3
= 15. 4 − 7 − 5 + 3
= 15. −5
= −75
25) 73(8-59) -59(8-73)
= 73.8 − 73.59 − 59.8 + 59.73
= 8 73 − 59 + 59 −73 + 73
= 8.14 + 59.0
= 112
15 (4-7)- 15 (5-3)
=15. 4 − 7 − 5 − 3
= 15. 4 − 7 − 5 + 3
= 15. −5
= −75
25) 73(8-59) -59(8-73)
= 73.8 − 73.59 − 59.8 + 59.73
= 8 73 − 59 + 59 −73 + 73
\(87\frac{23}{59}+74\frac{17}{71}+12\frac{36}{59}+25\frac{54}{71}=...........\)
chi tiết nhé các bạn
\(=87+\frac{23}{59}+74+\frac{17}{71}+12+\frac{36}{59}+25+\frac{54}{71}\)
=\(\left(87+74+12+25\right)+\left(\frac{23}{59}+\frac{36}{59}\right)+\left(\frac{17}{71}+\frac{54}{71}\right)\)
=\(198+1+1=200\)
tính nhanh
a) 25+38+59-5-19-8
b) 26-12+42-16+89-69
a) 25+38+59-5-19-8
=(25-5)+(38-8)+(59-19)
=20+30+40
=90
b)26-12+42-16+89-69
=(26-16)+(42-12)+(89-69)
=10+30+20
=60
a) 25+38+59-5-19-8 b) 26-12+42-16+89-69
= (25-5)+(38-8)+(59-19) = (26-16)+(42-12)+(89-69)
= 20+30+40 = 10+30+20
= 90 = 60
a) 25+38+59-5-19-8
=(25 - 5 ) + (38-8) +(59-19)
= 20 +30 + 40
= 60+40
=100
b) 26-12+42-16+89-69
= (26-16) + (42-12) + (89-69)
= 20+30+20
=50 +20
=70