Question

a) 2,15 x 23,06 + 2,15 x 76,94 + 17,85

b) 72,7 x 54,32 - 44,32 x 72,7 + 27,3

Answer 1

a) \(2,15x23,06+2,15x76,94+17,85\)

\(=2,15x\left(23,06+76,94\right)+17,85\)

\(=2,15x100+17,85\)

\(=215+17,85\)

\(=232,85\)

b) \(72,7x54,32-44,32x72,7+27,3\)

\(=72,7x\left(54,32-44,32\right)+27,3\)

\(=72,7x10+27,3\)

\(=727+27,3\)

\(=754,3\)

Answer 2

a) 2,15 x 23,06 + 2,15 x 76,94 + 17,85

= 2,15 x ( 23,06 + 76,94 ) + 17,85

= 2,15 x 100 + 17,85

= 215 + 17,85

= 232,85

b) 72,7 x 54,32 - 44,32 x 72,7 + 27,3

= 72,7 x ( 54,32 - 44,32 ) + 27,3

= 72,7 x 10 + 27,3

= 727 + 27,3 

= 754,3

Hok tốt !