Question

7．口算

16÷1.6=	0.15×4=	0.18×0.5=	13+0.26=
1.25×80=	8.1÷3=	4÷8=	1.3+8.46=
0.8-0.45=	5×2.4=	1-0.01=	0.56÷7=
9÷0.19=	0.36÷18=	9.9-0.9÷0.1=	7.5×4=
5.6×1.01=	0.36+0.64=	1.4×0.6=	1.2×0.4+0.4×1.3=

Answer 1

分析 根據(jù)小數(shù)加減乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．注意5.6×1.01，1.2×0.4+0.4×1.3根據(jù)乘法分配律計(jì)算．

解答 解：

16÷1.6=10	0.15×4=0.6	0.18×0.5=0.09	13+0.26=13.26
1.25×80=100	8.1÷3=2.7	4÷8=0.5	1.3+8.46=9.76
0.8-0.45=0.35	5×2.4=12	1-0.01=0.99	0.56÷7=0.08
9÷0.19=$\frac{900}{19}$	0.36÷18=0.02	9.9-0.9÷0.1=0.9	7.5×4=30
5.6×1.01=5.656	0.36+0.64=1	1.4×0.6=0.84	1.2×0.4+0.4×1.3=1

點(diǎn)評 考查了小數(shù)加減乘除法運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．