Question

直接寫(xiě)得數(shù)：13.75-7.5=	600÷15=	6.4×1.25=	0.1-0.1+0.1=
0.1÷0.1×0.1=	4.89×0.2×0.5=	0.25×4÷0.25×4=	（1.01-0.91）×5=
36×0.7×2.5=	1 2 + 1 3 =	1 4 +1 1 3 =	5 6 - 1 2 =
1 1 2 × 2 3 =	5 7 ×10=	3 4 ÷75%=	2 1 3 × 6 7 =
4÷4 4 5 =	1 1 2 -1 1 2 ÷1 1 2 =	0.6× 2 5 =	1- 1 4 -0.75=
1 2 + 1 2 - 1 2 × 1 2 =	7×50%÷1×50%+0=	1.25÷1 1 4 ×5%=	4÷ 1 4 + 1 4 ×4=
3 7 +0.67+1 4 7 =	4 5 17 -(3 5 17 +0.73)=	( 1 2 + 1 3 + 1 6 )×6=	( 1 4 -0.25)÷(7 1 13 -2 17 19 )=

Answer 1

分析：根據(jù)小數(shù)、整數(shù)、分?jǐn)?shù)和百分?jǐn)?shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算；
0.1-0.1+0.1、0.1÷0.1×0.1、0.25×4÷0.25×4、7×50%÷1×50%+0、1.25÷1

1

4

×5%按照從左向右的順序進(jìn)行計(jì)算；
4.89×0.2×0.5、36×0.7×2.5根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算；
1-

1

4

-0.75、4

5

17

-(3

5

17

+0.73)根據(jù)連減的性質(zhì)進(jìn)行簡(jiǎn)算；

3

7

+0.67+1

4

7

根據(jù)加法交換律進(jìn)行簡(jiǎn)算；
(

1

2

+

1

3

+

1

6

)×6根據(jù)乘法分配律進(jìn)行簡(jiǎn)算．

解答：解：

13.75-7.5=6.25	600÷15=40	6.4×1.25=8	0.1-0.1+0.1=0.1
0.1÷0.1×0.1=0.1	4.89×0.2×0.5=0.489	0.25×4÷0.25×4=16	（1.01-0.91）×5=0.5
36×0.7×2.5=63	1 2 + 1 3 = 5 6	1 4 +1 1 3 =1 7 12	5 6 - 1 2 = 1 3
1 1 2 × 2 3 =1	5 7 ×10= 50 7	3 4 ÷75%=1	2 1 3 × 6 7 =2
4÷4 4 5 = 5 6	1 1 2 -1 1 2 ÷1 1 2 = 1 2	0.6× 2 5 =0.24	1- 1 4 -0.75=0
1 2 + 1 2 - 1 2 × 1 2 = 3 4	7×50%÷1×50%+0=1.75	1.25÷1 1 4 ×5%=0.05	4÷ 1 4 + 1 4 ×4=17
3 7 +0.67+1 4 7 =2.67	4 5 17 -(3 5 17 +0.73)=0.27	( 1 2 + 1 3 + 1 6 )×6=6	( 1 4 -0.25)÷(7 1 13 -2 17 19 )=0

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．