58 x 63/ 42 x 87
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{58x63}{42x87}=\frac{2x29x7x9}{6x7x3x29}=\frac{2x7x9x29}{2x7x3x3x29}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
X=(1800+600):30):560:(315:35)
X=(2400:30):560:9
X=80:560:9
X=80x1/560x1/9
X=1/7x1/9
X=1/63
A=58x72+63x81-58x52-63x61
= (58x72-58x52)+(63x81-63x61)
= 58(72-52)+63(81-61)
= 58x20+63x20
= 1160+1260
= 2420
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có: \(\left(-65\right)\cdot\left(87-17\right)-87\cdot\left(17-65\right)\)
\(=-65\cdot87+65\cdot17-87\cdot17+87\cdot65\)
\(=17\left(65-87\right)=17\cdot\left(-22\right)=-374\)
b) Ta có: \(\left(135-35\right)\cdot\left(-37\right)+37\cdot\left(-42-58\right)\)
\(=\left(-100\right)\cdot37+37\cdot\left(-100\right)\)
\(=37\left(-100-100\right)=37\cdot\left(-200\right)=-7400\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(100+42) x42+(200-58)x58
=142x42+142x58
=142x(42+58)
=142x100
=14200
\(\left(100+42\right)\times42+\left(200-58\right)\times58\)
\(=142\times42+142\times58\)
\(=142\times\left(42+58\right)\)
\(=142\times100=14200\)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,17 x 250 + 63 x 1,7 - 87 x 1,7
=1,7x25+ 63 x 1,7 - 87 x 1,7
=1,7x(25+63-87)
=1,7x1
=1,7
![](https://rs.olm.vn/images/avt/0.png?1311)
(100 + 42 ) x 42 + ( 200 - 58 ) x 58
= 142 x 42 + 142 x 58
= 142 x ( 42 + 58 )
= 142 x 100
= 14200
( 100 + 42 ) x 42 + ( 200 - 58 ) x 58
= 142 x 42 + 142 x 58
= 142 x ( 42 + 58 )
= 142 x 100
= 14200
![](https://rs.olm.vn/images/avt/0.png?1311)
a) X : 4 = 58 b) 7 x X = 63
X = 58 x 4 X = 63 : 7
X = 232 X = 9
bạn ơi = 5769
mình nhanh nhất
đáp án là 7569 nha
chúc học tốt