Question

14．直接寫得數(shù)．

1.5+2.7=	15.4-2.4=	25×6=	1-0.8=	1.2÷10=
4-0.09=	3.2-2.3=	78÷3=	0.032×100=	5.1+3.09=
5-4.12=	0.35+12=	7.48×10=	4.8+6.2=	0×3.2=
36÷1000=	25×7×4=	125×8+50=	6.56-2.37+3.44=	5.85-1.75-0.25=

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25×7×4根據(jù)乘法交換律和結(jié)合律計(jì)算，6.56-2.37+3.44，根據(jù)加法交換律和結(jié)合律計(jì)算，5.85-1.75-0.25根據(jù)減法的性質(zhì)計(jì)算．

解答 解：

1.5+2.7=4.2	15.4-2.4=13	25×6=150	1-0.8=0.2	1.2÷10=0.12
4-0.09=3.91	3.2-2.3=0.9	78÷3=29	0.032×100=3.2	5.1+3.09=8.19
5-4.12=0.88	0.35+12=12.35	7.48×10=74.8	4.8+6.2=11	0×3.2=0
36÷1000=0.036	25×7×4=700	125×8+50=1050	6.56-2.37+3.44=7.63	5.85-1.75-0.25=3.85

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．