Question

4 5 + 2 5 =	8 5 ÷ 4 5 =	3.6× 1 9 =	0.42=	70π=
1 6 + 2 3 =	5 8 ×0.2=	5 7 × 3 5 =	22=	3π=
7 8 - 3 8 =	2 3 ×1.5=	0.12=	9π=	0.5π=
4 5 × 15 16 =	3.5× 5 7 =	202=	0.8π=	10π=

Answer 1

分析：根據(jù)分?jǐn)?shù)加減法、分?jǐn)?shù)乘除法和有理數(shù)的計(jì)算方法進(jìn)行計(jì)算即可得到答案．

解答：解：

4 5 + 2 5 =1 1 5	8 5 ÷ 4 5 =2	3.6× 1 9 = 2 5	0.42=0.16	70π=219.8
1 6 + 2 3 = 5 6	5 8 ×0.2= 1 8	5 7 × 3 5 = 3 7	22=4	3π=9.42
7 8 - 3 8 = 1 2	2 3 ×1.5=1	0.12=0.01	9π=28.26	0.5π=1.57
4 5 × 15 16 = 3 4	3.5× 5 7 =2 1 2	202=400	0.8π=2.512	10π=31.4

點(diǎn)評：此題主要考查的是分?jǐn)?shù)加減法、分?jǐn)?shù)乘除法和有理數(shù)的計(jì)算方法的應(yīng)用．