直接写得数．
1﹣0.007=0×0.78= 4×0.9×2.5=5.2÷0.5÷4=
0.87+0.01=2.5÷0.1=8×0.5÷8×1.6=4.8÷0.3=
用自己喜欢的方法计算．
（1）5.6×5.3+4.7×5.6（2）1.25×1.37×80．
直接写出下列各题的得数．
12.5×0.8=3.2÷0.16=8.8÷2.2=
0.8×5×0.2=0.25×4÷0.25×4=1.25×16=
计算，怎样算简便就怎样算
102×（4.5÷0.09）19.96×5.4﹣4.4×19.963.8+2.49+7.51+4.2
2.3+3.91÷（22﹣19.7）（1﹣0.2）×[13﹣（3.12+5.28）]9.9×1.45．
递等式计算，能简算的要简算．
4.8×0.252.33×0.5×41.2×2.5+0.8×2.5
50.4×1.9﹣1.93.7×0.25+40.65×201．