12.5×1.7×0.8
2.5×4.4=2.5×4×1.1运算的依据是乘法的分配律.
3.1×1.25×8=3.1×(1.25×8)运用了乘法交换律。
①2.75×6.2+27.5×0.38
②0.125×32×2.5
③15.72-2.17-1.83+4.28
④
⑤
⑥
①19.5-11.68-2.32
②528×101-528
③0.25×4.78×4
④700÷25÷4
⑤12×[(96+84)÷5]
⑥0.78×99=(列竖式计算)
①34.13﹣15.87﹣14.13
②1.2﹣3.67+9.8﹣6.33
③25×(0.4+0.04)
④19×956+19×44
⑤23÷2.3﹣2.5×0.8
⑥0.8×[(10﹣6.76)÷1.2]
①0.87÷2.9×1.3
②4.62÷(5.4÷0.09)
③(2.77+1.33)÷0.25
④0.225÷0.25÷4
⑤4.5×2.4+5.5×2.4
⑥3.15×101-3.15