Question

14．口算

6.3+3.7=	2.6÷0.2=	2.5×8=	70×0.6=	0.49÷0.7=
0.12×0.3=	750-480=	70÷500=	4.3+0.19=	0.75×100=
12-9.9=	1÷0.25=	8.2+2.6=	6.06÷6=	0.72=
5.5×2=	50×0.8=	2.4×0.5=	0.32+2.68=	1.02×5=
4.5×0.1=	390+140=	1.5×2=	1.8-0.9=	8.9÷100=
1.7×40=	3.6÷0.4=	9.9÷0.1=	2.5×50=	0.48÷6=
900-63=	5.2÷1.3=	0.87-0.49=	0.5×12=	8.7+1.3×4=
320÷5÷2=	198-99×2=	5×1.5×4=	1.1-0.6-0.4=	4×23×0.25=

Answer 1

分析 根據(jù)小數(shù)加減乘除法的計算方法進(jìn)行解答即可，320÷5÷2運(yùn)用除法的性質(zhì)進(jìn)行簡算，5×1.5×4運(yùn)用乘法的交換律進(jìn)行簡算，1.1-0.6-0.4運(yùn)用減法的性質(zhì)進(jìn)行簡算，4×23×0.25運(yùn)用乘法的交換律進(jìn)行簡算．

解答 解：

5.5×2=11	50×0.8=40	2.4×0.5=1.2	0.32+2.68=3	1.02×5=5.1
4.5×0.1=0.45	390+140=530	1.5×2=3	1.8-0.9=0.9	8.9÷100=0.089
1.7×40=68	3.6÷0.4=9	9.9÷0.1=99	2.5×50=125	0.48÷6=0.08
900-63=837	5.2÷1.3=4	0.87-0.49=0.38	0.5×12=6	8.7+1.3×4=13.9
320÷5÷2=32	198-99×2=0	5×1.5×4=30	1.1-0.6-0.4=0.1	4×23×0.25=23

點(diǎn)評 此題考查了小數(shù)加減乘除法的口算能力，注意靈活運(yùn)用運(yùn)算定律進(jìn)行簡算．