Question

10．口算

0.8×1.25=	0.3×3.6=	0.3×0.3=	10×0.07=
0.3×1.4=	0.05×7=	0.92×0.4=	0.2×0.26=
0.96÷0.3=	1.5×0.4=	2.5×0.7×0.8=	8-2.5=
16÷1.6=	（1.5+0.25）×4=

Answer 1

分析 根據(jù)小數(shù)乘法計算法則口算第1題-第8題，根據(jù)小數(shù)除法計算法則計算0.96÷0.3，16÷1.6，2.5×0.7×0.8根據(jù)乘法結(jié)合律先算2.5×0.8再乘以0.7，（1.5+0.25）×4先算括號里面的，再算括號外面的．

解答 解：

0.8×1.25=1	0.3×3.6=1.08	0.3×0.3=0.09	10×0.07=0.7
0.3×1.4=0.42	0.05×7=0.35	0.92×0.4=0.368	0.2×0.26=0.052
0.96÷0.3=3.2	1.5×0.4=0.6	2.5×0.7×0.8=1.4	8-2.5=5.5
16÷1.6=10	（1.5+0.25）×4=7

點評 此題考查了小數(shù)乘法、小數(shù)除法、小數(shù)加法、小數(shù)減法計算方法以及小數(shù)四則混合運算順序的應(yīng)用．