口算题．
260+80= 102×80= 72+36+28= 630÷90=
125×8= 940÷20= 837﹣123﹣77= 36×74+36×24=
8×12×5=
计算下面各题，能简算的要简算．
①0.65×101②76.43﹣5.33﹣4.67③3.4÷[7.8﹣（3.9+2.2）]
④13.7÷12.5÷0.8⑤3.25×8.4+6.75×8.4⑥[1.4×2﹣（0.65+0.55）]÷40．
计算下面各题能简算的要简算．
12.25+36+7.7523.7×0.25×84.8÷0.24÷2
2.3+9×（22﹣19.7）0.8×[13﹣（3.12+5.28）]10.1×87．
直接写得数．
11×1.8+8.2×0.110.6×（1.4﹣2.99÷2.3）4÷（3.94+0.86）×0.80.25×32×1.25．
怎样简便就怎样计算
①1.25×1.4×8②15﹣1.7﹣1.3 ③7×0.2×1.5
④32.2×4+17.8×4⑤10.1×87⑥47.2÷4÷5.9．
灵活计算，能用简便方法的要简算．
10.1×85125×9.3×0.0843.72×7.9+2.1×43.27
93÷0.25÷42.3+3.91÷（22﹣19.7）7.92×6﹣18.45÷3
6.78+6.78×9918﹣（1.4+1.25×2.4）0.8×[13﹣（3.12+5.28）]．