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21.72-72.11+90.72+49.125.16
=72.(49+21).90+125.16
=14.70+90+125.16
=(14+16).90-20+125
=20-20.125+90
=0
b)
(22+21+22+23).20.21.23.22
=(22-22-22).(23-23).(21-21) 20
=0.0.0.0
=0
hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
21*7^2 -11*7^2 +90*7^2 +49*125*16
=7^2* ( 21 -11+ 90 ) + 7^2* 2000
=7^2* 100 + 7^2* 2000
=7^2* ( 100+ 2000 )
=49*2100
=102900
![](https://rs.olm.vn/images/avt/0.png?1311)
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a, -326-(115-326)=-326-(-326)-115=(-326+326)-115=-115
b,-13-18-(-42)-15=-13-18+42-15=-4
c,(-558+558)+(-50+50)=0+0=0
d,35-12+16=39
e,18.17-3.6.7=18.17-18.7=18.(17-7)=18.10=180
f,21.72-11.72+90.72+49.125.10
=21.72-11.72+90.72+72.1250
=72.(21-11+90+1250)
=72.1350=49.1350
=66150
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Bài 1: Thực hiện phép tính ( tính nhanh nếu có thể )
A = 21 . 72 - 11 . 72 + 90 . 72 + 49 .125 .16
=> A=21.72-11.72+90.72+72.125.16
=> A=72.(21-11+90+125.16)
=> A=72.2100=102900
cảm ơn nguyen tung lam .nhưng mình cần cậu giúp cả 2 ý . nen cau giup minh not y b nhe
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a, \(35\times34+35\times86+65\times75+65\times45\)
\(=35\times(34+86)+65\times(75+45)\)
\(=35\times120+65\times120\)
\(=(35+65)\times120=100\times120=12000\)
b, \(21\times7^2-11\times7^2+90\times7^2+49\times125\times16\)
Làm nốt
a)35 x 34 + 35x 86 + 65 x 75 + 65 x 45
=35 x (34+86) + 65 x (75 + 45)
=35 x 120 + 65 x 120
=120 x (35 + 65)
=120 x 100
=12000
Chúc học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
\( 21 . 7^2 - 11 . 7^2 + 90 . 7^2 + 49 . 125 . 16\)
\(=21.7^2-11.7^2+90.7^2+7^2(125.8).2\)
\(=7^2(21-11+90+2000)\)
\(=49.2100=102900\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) M = -5/7 . 2/11 + -5/7 . 9/11 + 12/7
M = -5/7 . ( 2/11 + 9/11 ) + 12/7
M = -5/7 . 1 + 12/7
M = -5/7 + 12/7
M = 1
b) N = 6/7 + 5/8 : 5 - 3/16 . ( -2 ) mũ 2
N = 6/7 + 1/8 - 3/16 . 4
N = 48/56 + 7/56 - 3/4
N = 55/56 - 42/56
N = 13/56
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123.456+123.789-1245.23
=123.(456+789)-1245.23
=123.1245-1245.23
=1245.(123-23)
=1245.100
=124500
=123.(456+789)-1245.23
=123.1245-1245.23
=1245.(123-23)
=1245.100
=124500
SUY RA A=
dễ mà tự làm đi!