[75 x 19] x30 :19 x28 -132=?
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`@Neo`
`75/100 + 3/4 xx 29 +75% xx 30 + 0,75 xx 40 `
`=75/100+3/4xx29+75/100xx30+3/4xx40`
`=75/100+75/100xx29+75/100xx30+75/100xx40xx1`
`=75/100xx(29+1+30+40)`
`=75/100xx100`
`=7500/100=75/1=75`
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`75/100 + 3/4 xx 29 +75% xx 30 + 0,75 xx 40 `
`=75/100+3/4xx29+75/100xx30+3/4xx40`
`=3/4+3/4xx29+75/100xx30+3/4xx40xx1`
`=3/4xx(29+1+30+40)`
`=3/4xx100`
`=300/4=75/1=75`
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`75/100 + 3/4 xx 29 +75% xx 30 + 0,75 xx 40 `
`=0,75+0,75×29+0,75×30+0,75×40`
`=0,75×(1+29+30+40)`
`=0,75xx100`
`=75`
A : 196 x 56 + 196 x 41 + 4 x 196 - 196 x 1
= 196 x ( 56 + 41 + 4 - 1 )
= 196 x 100
= 19 600
B : 132 x 19 + 132 x 18 + 64 x 132 - 132 x 1
= 132 x ( 19 + 18 + 64 - 1 )
= 132 x 100
= 13 200
C : 145 x 69 + 145 x 32 - 145 x 1
= 145 x ( 69 + 32 - 1 )
= 145 x 100
= 14 500
A = 196 x 56 + 196 x 41 + 4 x 196 - 196
A = 196 x ( 56 + 41 + 4 - 1 )
A = 196 x 100 = 19600
B = 132 x 19 + 132 x 18 + 64 x 132 - 132
B = 132 x ( 19 + 18 + 64 - 1 )
B = 132 x 100 = 13200
C = 145 x 69 + 145 x 32 - 145
C = 145 x ( 69 + 32 - 1 )
C = 145 x 100 = 14500
\(=\frac{75}{100}x1+\frac{75}{100}x29+\frac{75}{100}x30+\frac{75}{100}x40\)
\(=\frac{75}{100}x\left(1+29+30+40\right)\)
\(=\frac{75}{100}x100\)
\(=75\)
đáp số: 62868
62868