Question

2．

30×0.5=	0.78×0.2=	340-127=
10÷0.05=	3.92+3.79=	629-138=
29.2-6.5=	2.8-1.91=	3.4×2=
3.9×20=	3.2+0.27=	0.5×0.28=
3.6÷0.02=	24×9=	2.5+5.6=
0.8×0.9=	1.5×8=	2.8÷0.4=
3.9-2.18=	0.35×7=	5.1÷1.7=
720÷20=	1.5×5=	3.2÷4=
2.6×4=	8-0.125=	72.6÷6=
0.38+4.92=	3.4×5=	70.7÷7=
3.8÷0.2=	1.23+3.46=	23.5-（3.5+6）=
3.6×0.2=	2.5×8=	2.6×3÷2.6×3=
3.18+0.43=	1.2×25=	25×2.4=
4×0.25=	6.5-0.8=	33.9-2.5-7.5=
1.4×0.7=	5-2.1=	7.25×4=
3.18+2.78=	3.75÷0.5=	6.8÷0.25=
6.24-0.38=	3.14+5.7=	170-25=
3.4×0.7=	3.28-1.8=	162÷10=
0.78-0.39=	3.6×5=	12.7-5+7.3=
0.125×80=	16.8÷21=	1.9×40=

Answer 1

分析 根據(jù)整數(shù)、小數(shù)加減乘除法的計(jì)算方法進(jìn)行解答即可，23.5-（3.5+6）、33.9-2.5-7.5運(yùn)用減法的性質(zhì)進(jìn)行簡算，2.6×3÷2.6×3運(yùn)用乘法的交換律、除法的性質(zhì)進(jìn)行簡算．

解答 解：

30×0.5=15	0.78×0.2=0.156	340-127=213
10÷0.05=200	3.92+3.79=7.71	629-138=491
29.2-6.5=22.7	2.8-1.91=0.89	3.4×2=6.8
3.9×20=78	3.2+0.27=3.47	0.5×0.28=0.14
3.6÷0.02=180	24×9=216	2.5+5.6=8.1
0.8×0.9=0.72	1.5×8=12	2.8÷0.4=7
3.9-2.18=1.72	0.35×7=2.45	5.1÷1.7=3
720÷20=36	1.5×5=7.5	3.2÷4=0.8
2.6×4=10.4	8-0.125=7.875	72.6÷6=12.1
0.38+4.92=5.3	3.4×5=17	70.7÷7=10.1
3.8÷0.2=19	1.23+3.46=4.69	23.5-（3.5+6）=14
3.6×0.2=0.72	2.5×8=20	2.6×3÷2.6×3=9
3.18+0.43=3.61	1.2×25=30	25×2.4=60
4×0.25=1	6.5-0.8=5.7	33.9-2.5-7.5=23.9
1.4×0.7=0.98	5-2.1=2.9	7.25×4=29
3.18+2.78=5.96	3.75÷0.5=7.5	6.8÷0.25=27.2
6.24-0.38=5.86	3.14+5.7=8.84	170-25=145
3.4×0.7=2.38	3.28-1.8=1.48	162÷10=16.2
0.78-0.39=0.39	3.6×5=18	12.7-5+7.3=15
0.125×80=10	16.8÷21=0.8	1.9×40=76

點(diǎn)評 此題考查了整數(shù)、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．