Question

16．直接寫出得數(shù)．

0.1÷0.01=	0.81÷0.3=	2.9+3.7+6.1=
3.6÷2.5÷4=	99×1.2+1.2=	39.8-7.2-2.8=
44×0.25=	1.25×5×8=	7.6×8+2.4×8=

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2.9+3.7+6.1變形為2.9+6.1+3.7計(jì)算，3.6÷2.5÷4根據(jù)除法的性質(zhì)計(jì)算，99×1.2+1.2，44×0.25，7.6×8+2.4×8根據(jù)乘法分配律計(jì)算，39.8-7.2-2.8根據(jù)減法的性質(zhì)計(jì)算，1.25×5×8變形為1.25×8×5計(jì)算．

解答 解：

0.1÷0.01=10	0.81÷0.3=2.7	2.9+3.7+6.1=12.7
3.6÷2.5÷4=0.36	99×1.2+1.2=120	39.8-7.2-2.8=29.8
44×0.25=11	1.25×5×8=50	7.6×8+2.4×8=80

點(diǎn)評(píng) 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．