Question

Tính nhanh

43*(85-81)+85*(81-43)

Answer 1

43x (85-81) + 85x(81-43)

= 43 x 85 - 43 x 81 + 85 x 81 - 85x 43

= 43 x 85 - 85 x 43 + 85x 81 - 43x 81

= 0 + 81 x ( 85 - 43 ) 

= 0 + 3402

= 3402

Answer 2

43x(85-81)+85x(81-43)=43x85-43x81+85x81-85x43

=(43x85-85x43)+(85x81-43x81)

=0+81x(85-43)

=81x42

=3402

Answer 3

43 x (85 - 81) + 85 x (81 - 43)

= 43 x 85 - 43 x 81 + 85 x 81 - 85 x  43

= 43 x 85 - 85 x 43 + 85 x 81 - 43 x 81

= 0 + 81 x (85 - 43) 

= 0 + 3402

= 3402

Nhớ  nha!

Answer 4

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