Question

简便计算4.6×1.25+1.25+1.5×0.34 4.28×99 15×0.4×2.5

Answer 1

简便计算
4.6×1.25+12.5×0.34
=4.6×1.25+1.25×3.4
=（4.6+3.4）×1.25
=8×1.25
=10

4.28×99
=4.28×（100-1）
=4.28×100-4.28
=428-4.28
=423.72

15×0.4×2.5
=15×（0.4×2.5）
=15×1
=15

Answer 2

4.6×1.25+1.25+1.5×0.34
=1.25×（4.6+1）+1.5×0.34
=1.25×5.6+3×0.17
=1.25×8×7+0.51
=10×7+0.51
=70.51