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( 31,5 * 26,3 - 42,5 * 13,2 ) * ( 53 * 11 - 5300 * 0,1 - 53 )
= ( 31,5 * 26,3 - 42,5 * 13,2 ) * ( 53 * 11 - 53 * 100 * 0,1 - 53 * 1 )
= ( 31,5 * 26,3 - 42,5 * 13,2 ) * ( 53 * 11 - 53 * 10 - 53 *1)
= ( 31,5 * 26,3 - 42,5 * 13,2 ) * [ 53 * ( 11 - 10 - 1 )]
= ( 31,5 * 26,3 - 42,5 * 13,2 ) * ( 53 * 0 )
= ( 31,5 * 26,3 - 42,5 * 13,2 ) * 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
heheheheheheboyyyy
a, x:0,5+x:0,125 đáp án đâu baaa
b,(3,5x10)x(53x11-5300x0,1-53)
(3,5x10)x(53x11-53x10-53x1)
(3,5x10)x[53x(11-10-1)]
(3,5x10)x(53x0)
35x0
=0
tick hộ anh vs
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Gọi (22,8*0.7+78.3*0.8) là A, ta có:
A*(9*0.9+0.9-0.9*10) = A*(0.9*10-0.9*10)
= A*0 = 0
b) Gọi (13,5*26,6-24,5*13,2) là B, ta có:
B*(53*11-5300*0.1-53) = B*(53*11-53*100*0,1-53)
= B*(53*11-53*10-53*1)
= B*53*(11-10-1) = B*53*0 = 0
{22,8x0,7+78,3x0,8}x{9x0,9+0,9-0,9x10}
(22,8x0.7+78.3x0.7+78.3x1)x{0.9x(9+1+10)}
=78.6x18
=1414.8
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{32\times53-21}{53\times31+32}\)
\(=\frac{\left(31+1\right)\times53-21}{53\times31+32}\)
\(=\frac{31\times53+53-21}{53\times31+32}\)
\(=\frac{31\times53+32}{53\times31+32}\)
\(=1\)
\(\frac{32\times53-21}{53\times31+32}=\frac{\left(31+1\right)\times53-21}{31\times53+32}\)
\(=\frac{31\times53+53-21}{31\times53+32}=\frac{31\times53+32}{31\times53+32}\)
\(=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A = (91,5 X 26,3 - 17,4 x 52,6)x(41x11 -4100 x0,1 - 41)
A = (91,5 x 26,3 - 17,4 x 52,6) x 41 x (11 - 100X0,1 - 1)
A = (91,5 x26,,3 - 17,4 x 52,6) x 41 ( 11 - 10 - 1)
A = (91,5 x26,,3 - 17,4 x 52,6) x 41 x 0
A = 0
![](https://rs.olm.vn/images/avt/0.png?1311)
A= 1/2 + 1/4+ 1/8+ 1/16 + 1/32 + 1/64 + 1/128 + 1/256 + 1/512
A = 1 - 1/2 + 1/2- 1/4 + 1/4 - 1/8 + 1/8 - 1/16 + 1/16 - 1/32 + 1/32 - 1/64 + 1/64 - 1/128 + 1/128 - 1/256 - 1/256 - 1/512
A = 1 - 1/512
Ủng hộ mk nha! ^_^