Question

口算 1.2÷0.2=	2.5×4=	0.25+4=	1.87×0=
3.5+0.5=	1.2÷0.4=	3.6÷4=	0÷1.25=
0.12×6=	0.64×0.03=	5.8+4.2-6.5=	7.8÷3=
0.125×8=	2.8÷1.4=	0.25÷0.5=	7.21÷7=
0.35÷10=	3.6÷3=	6.3÷0.9=	0.54÷6=
0.3×0.1=	1.3÷2=	0.4÷8=2	7.3÷3=
0.51÷0.3=	15÷0.01=	5÷10=	0.7×12=
0.2×0.5=	3.8×0.1=	0.2×0.2=	0.04×0.4=
12.4+7.6=	8×0.5=	0.72÷36=	9×2.5+2.5=
1.8÷3=	2.3÷2=	6.5÷5=	2.14÷2=
2.5×4=	2.7×2=	0.5×7=	4.8+3.6+5.2=
3.4÷1.7=	2.5+0.2=	4.5÷5=	5+2.8=
0.8×0.3=	13.5×2×0=	5.25÷5=	4×2.2=
0.12×0.5=	1.8×5=	6.24÷2=	2.83-1.43=
1.2+2.9=	3.8÷2=	1.32×3=	4.6×7=

Answer 1

解：1.2÷0.2=6	2.5×4=10	0.25+4=4.25	1.87×0=0
3.5+0.5=4	1.2÷0.4=3	3.6÷4=0.9	0÷1.25=0
0.12×6=0.72	0.64×0.03=0.0192	5.8+4.2-6.5=3.5	7.8÷3=2.6
0.125×8=1	2.8÷1.4=2	0.25÷0.5=0.5	7.21÷7=1.03
0.35÷10=0.035	3.6÷3=1.2	6.3÷0.9=7	0.54÷6=0.09
0.3×0.1=0.03	1.3÷2=0.65	0.4÷8=0.05	7.3÷3=2.433…
0.51÷0.3=1.7	15÷0.01=1500	5÷10=0.5	0.7×12=8.4
0.2×0.5=0.01	3.8×0.1=0.38	0.2×0.2=0.04	0.04×0.4=0.016
12.4+7.6=20	8×0.5=4	0.72÷36=0.02	9×2.5+2.5=25
1.8÷3=0.6	2.3÷2=1.15	6.5÷5=1.3	2.14÷2=1.07
2.5×4=10	2.7×2=5.4	0.5×7=3.5	4.8+3.6+5.2=13.6
3.4÷1.7=2	2.5+0.2=2.7	4.5÷5=0.9	5+2.8=7.8
0.8×0.3=0.24	13.5×2×0=0	5.25÷5=1.05	4×2.2=8.8
0.12×0.5=0.06	1.8×5=9	6.24÷2=3.12	2.83-1.43=1.4
1.2+2.9=4.1	3.8÷2=1.9	1.32×3=3.96	4.6×7=32.2

分析：運(yùn)用小數(shù)四則運(yùn)算的計(jì)算法則直接計(jì)算即可．
點(diǎn)評(píng)：此題考查學(xué)生的計(jì)算能力，計(jì)算時(shí)要細(xì)心，同時(shí)注意個(gè)別題使用運(yùn)算定律可以進(jìn)行簡(jiǎn)算．