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Ta có: ( 9x8-12-5x12) x (1+2+3+4+5)
=( 72-12-60) x ( 1+2+3+4+5)
=(60-60) x (1+2+3+4+5)
=0 x (1+2+3+4+5)
=0
Mọi người tk cho mình nha. Mình cảm ơn trước vậy ^.<
(9 x 8 - 12 - 5 x 12) x (1 + 2 + 3 + 4 + 5)
= (72 - 12 - 60) x (1 + 2 + 3 + 4 + 5)
= ( 60 - 60) x (1 + 2 + 3 + 4 + 5)
= 0 x (1 + 2 + 3 + 4 + 5)
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
( 1 + 2 + 3 + 4 + 5 ) x ( 12 - 3 x 4 )
= 15 x 0
= 0
_TH_
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a. 4 x 126 x 25
= (4 x 25) x 126
= 100 x 126
= 12600
b. (9 x 8 – 12 – 5 x 12) x ( 1 + 2 + 3 + 4 + 5)
= (72 – 12 – 60) x ( 1 + 2 + 3 + 4 + 5)
= 0 x ( 1 + 2 + 3 + 4 + 5)
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= ( 72 – 12 – 60 ) x ( 1 + 2 + 3 + 4 + 5)
= 0 x ( 1 + 2 + 3 + 4 + 5 )
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
Đáp án:
( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= ( 72 – 12 – 60 ) x ( 1 + 2 + 3 + 4 + 5)
= 0 x ( 1 + 2 + 3 + 4 + 5 )
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
X = ( 1+10 ) * 10 / 2 = 11 * 10 / 2 = 110 / 2 = 55
X= (2+20) * 10 /2 = 110
X= (1+19)*10/2= 100
1+2+3+4+5+6+7+8+9+10= (10+1)X10 : 2 = 55
2+4+6+8+10+12+14+16+18+20 = (20+2)x10 : 2 = 110
1+3+5+7+9+11+13+15+17+19 = (19+1) x 10 : 2 = 100
giải ra chi tiết giúp mink với ạ![khocroi khocroi](https://hoc24.vn/vendor/cke24/plugins/smiley/images/khocroi.png)
\(4\times126\times25\\ =\left(4\times25\right)\times126\\ =100\times126\\ =12600\)
\(\left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(72-12-60\right)\times15\\ =\left(60-60\right)\times15\\ =0\times15\\ =0\)