Question

7.5×2.3-0.5×2.5 22.5×0.4简便运算？

Answer 1

7.5×2.3-0.5×2.5 22.5×0.4
=（7.5×2.3+ 7.5x3×0.4）-0.5x2.5
=7.5x（2.3+1.2）-0.5x2.5
=7.5x3.5-0.5x2.5
=2.5x10.5-0.5x2.5
=2.5x（10.5-0.5）
=2.5x10
=25

Answer 2

简便计算为
7.5*2.3-0.5*2.5+22.5*0.4
=2.5*3*2.3-0.5*2.5+22.5*0.4
=2.5*（6.9-0.5）+22.5*0.4
=2.5*6.4+22.5*0.4
=16+9
=25