Question

直接寫(xiě)得數(shù) 3+9.7=	242.4÷12=
2.3÷10%=	6÷34=
2- 6 7 =	7 11 ×1 4 7 =
1÷7+ 6 7 =	5 6 + 3 4 =
5 9 - 5 11 + 4 9 =	1 6 ×3÷ 1 6 ×3=

Answer 1

分析：根據(jù)小數(shù)和分?jǐn)?shù)加減乘除法的計(jì)算方法進(jìn)行計(jì)算；

5

9

-

5

11

+

4

9

根據(jù)加法交換律進(jìn)行簡(jiǎn)算．

解答：解：

3+9.7=12.7	242.4÷12=20.2
2.3÷10%=23	6÷34= 3 17
2- 6 7 =1 1 7	7 11 ×1 4 7 =1
1÷7+ 6 7 =1	5 6 + 3 4 = 19 12
5 9 - 5 11 + 4 9 = 6 11	1 6 ×3÷ 1 6 ×3=9

點(diǎn)評(píng)：口算時(shí)，注意運(yùn)算符號(hào)和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．