Question

直接寫得數(shù)． 4 5 + 2 5 =	0÷ 3 5 =	8 15 ×6=	7.125- 1 8 =
8.4+8=	3：0.5=	6÷ 3 20 =	100×0.1%=
5 6 - 1 5 =	3 8 × 4 9 =	3 7 ÷ 9 14 =	1÷5× 1 5 =
3 4 × 1 4 ÷3=	3 5 ×4+ 3 5 =	2- 5 12 - 7 12 =	1 6 ×5÷ 1 6 ×5=

Answer 1

分析：根據(jù)分?jǐn)?shù)加減法、分?jǐn)?shù)乘除法、小數(shù)加減法和百分?jǐn)?shù)的運(yùn)算進(jìn)行計(jì)算即可得到答案，其中算式

3

5

×4+

3

5

可利用乘法分配律進(jìn)行計(jì)算比較簡便，算式2-

5

12

-

7

12

可改寫為2-（

5

12

+

7

12

）進(jìn)行計(jì)算比較簡便．

解答：解：

4 5 + 2 5 =1 1 5	0÷ 3 5 =0	8 15 ×6=3 1 5	7.125- 1 8 =7
8.4+8=16.4	3：0.5=6	6÷ 3 20 =40	100×0.1%=0.1
5 6 - 1 5 = 19 30	3 8 × 4 9 = 1 6	3 7 ÷ 9 14 = 2 3	1÷5× 1 5 = 1 25
3 4 × 1 4 ÷3= 1 16	3 5 ×4+ 3 5 =3	2- 5 12 - 7 12 =1	1 6 ×5÷ 1 6 ×5=25

點(diǎn)評：此題主要考查的是分?jǐn)?shù)加減法、分?jǐn)?shù)乘除法、小數(shù)加減法、百分?jǐn)?shù)的運(yùn)算和簡便運(yùn)算的計(jì)算方法．