用你喜欢的方法计算.376﹣720÷9 654÷6×4 854÷(56﹣49) 321×3﹣158.
直接写出得数.6.5+7.5= 2.9+0.47= 3﹣2.3= 5.3﹣0.8=5.6÷8= 2.4×0.6= 1.25×8= 1.2÷0.06=
口算.3.5﹣1.7= 54÷100= 6.4+3.6=0.4+0.12= 1.25+0.6= 3.8×10=425÷10= 0.07×100= 10﹣2.5=
口算:0.4×0.02= 3.2+6.8= 0.39÷1.3= 2.4×2.5=1÷0.125= 1﹣0.25= 0.62÷0.1= 99×0.25=1.2×0.4+0.4×1.3= 4×(1.5+0.25)=
估算下面各题. 4.03×1.98≈ 3.95×0.2≈ 8.1×10.01≈ 16.2÷1.9≈59.8÷3.1≈ 10.32÷0.21≈ 99.9÷0.5≈ 70.2×3.02≈
估算.3.75×2.8≈ 96.2÷0.26≈ 6.27÷1.9≈