分数乘法的意义与整数乘法的意义相同.
2.5×4.4=2.5×4×1.1运算的依据是乘法的分配律.
8.12++1.88-0.8
0.5+8÷13+
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]
①
②1.25×1.3×80
③7.28-3.14+1.72-2.86
④
⑤
⑥
①2.75×6.2+27.5×0.38
②0.125×32×2.5
③15.72-2.17-1.83+4.28