Question

tính nhanh

 

4×5,6×2,5

2,37×7,2+5×7,2+7,2×2,63

 

Answer 1

4x5,6x2,5=(4x2,5)x5,6=1x5,6=5,6

2,37x7,2+5x7,2+7,2x2,63=7,2x(2,37+5+2,63)=7,2x10=72

Answer 2

a , 4 x 5,6 x 2,5 = (4 x 2,5) x 5,6 =10 x 5,6 =56

b, 2,37 x 7,2 + 5 x 7,2 + 2,63 = 7,2 x ( 2,37 + 2,63 + 5 ) = 7,2 x 10 = 72