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1.7*2.3-2.3 怎样用简便方法计算

发布时间:2020-09-09

2+1/15+7/14
=(3/8+2/7
=1-(3/14-1/12+7/4+8/15+8/2+1
=1又1/7
=2/3+2/12)+(7/8+1/14--1/4--1/15+8/7)
=1-5/12
=(5/2
=1

5/12+7/15)
=1+1
=2

1--3/8-1/7

3/3)
=1/4-1/7--2/7+2/3--1/8)+(1/4)+(8Ǜ/3
=(5/14)
=1/

回复:

1/8+6.875=7然后在加上 (5/7+2/7=1)最后得8

回复:

4.5+6.2×3缉沪光疚叱狡癸挟含锚.7
=(3.7+0.8)+6.2×3.7
=(6.2+1)×3.7+0.8
=7.2×3.7+0.8
=26.64+0.8
=27.44

回复:

没办法用简便的把
4.5+6.2×(4-缉沪光疚叱狡癸挟含锚0.3)
=4.5+6.2×4-6.2×0.3
=4.5+24.8-1.86
=自己算

回复:

5)·3/7+2/10-1/.875)+1=7+1=8 (2)=(1/.875+2/.125+6.875)+(5/5·3/8+6;3·3/5-1/8+5/2·3/2 =-1/3·2/3·2/5 =1/7+6;5 =3/7=(1/7)=(0;2-1/(1)1/

回复:

6.875=6又7/8;第二题分母通分

回复:

(1)1/8+5/7+6.875+2/7=(1/8+6.875)+(5/7+2/7)=(0.125+6.875)+1=7+1=8 (2)=(1/3·3/2-1/3·2/5)·3/5 =1/2·3/5-1/3·2/5·3/5 =3/10-1/2 =-1/5

回复:

(1)4.2÷0.25 =4.2x4÷(0.25x4) =16.8÷1 =16.8 (2)1.46+(7.7+0.54)+2.3 =(1.46+0.54)+(7.7+2.3) =2+10 =12 (3)(4.77+1.3)×(7-4.8÷8) =6.07x(7-0.6) =6.07x6.4 =6x6.4+0.07x6.4 =38.4+0.448 =38.848 (4)0.7÷【(0.7+0.7)×0.7-...

回复:

1. 18又9/20除以9 =18÷9+9/20÷9 =2+1/20 =2又1/20 2. 6.13-2/3-1/3+0.87 =6.13+0.87-(2/3+1/3) =7-1 =6 3. (5/24+7/12-2/3)*48 =5/24×48+7/12×48-2/3×48 =10+28-32 =6

回复:

1/2*4+1/3*5+1/4*6+1/5*7+...+1/8*10+1/9*11 =(1/2-1/4+1/3-1/5+1/4-1/6+1/5-1/7+……+1/8-1/10+1/9-1/11)÷2 =(1/2+1/3-1/10-1/11)÷2 =106/165÷2 =53/165

回复:

3.2-2.5=0.7 9.1÷7=1.3 9.1÷(3.2-2.5)=9.1×10/7=13 72.8+13=85.8

回复:

5/12+7/15+8/15+7/12 =(5/12+7/12)+(7/15+8/15) =1+1 =2 1--3/7--2/7 =1-(3/7+2/7) =1-5/7 =2/7 3/4+8/14--1/4--1/14 =(3/4-1/4)+(8/14-1/14) =1/2+1/2 =1 5/8+1/3--1/8+2/3 =(5/8-1/8)+(1/3+2/3) =1/2+1 =1又1/2

回复:

一个长方形的长是3又1/2米,宽是6/7米,体积是8立方米 宽:8÷6/7 ÷ 3(1/2)=8x7/6 x 2/7 = 8/3 米 1)从下列式子你发现了什么规律:1/n(n+1) = 1/n - 1/(n+1) 2)使用你找出来的规律计算:1/1*2+1/2*3+1/3*4+......+1/49*50 = 1 -1/2 + 1/2 - 1...

回复:

4.5+6.2×3.7 =(3.7+0.8)+6.2×3.7 =(6.2+1)×3.7+0.8 =7.2×3.7+0.8 =26.64+0.8 =27.44

回复:

可以 啊1. 3/4*1/9+1/4*1/9 2. 5/8*2/7+5/8*5/7 3. 101*1/5-1/5*21 4. 31*5*6-5/6 5. 8*4/5+8*11/5 6. 6*(1/2+2/3) 7. (3/5-1*2)*5/3 8. 12*(2*3+1/6) 9. 4/7*5/9+3/7*5/9 10. (3+1)*5/6 11. 5/2*(3/2+4/5) 12. 1/6*(2/3+3/4) 13. 7/72*(1/8+1/9...

回复:

17×40=680, 100-63=37, 3.2+1.68=4.88, 2.8×0.4= 1.12 14-7.4=6.6, 1.92÷0.04=48, 0.32×500=160, 0.65+4.35= 5 10-5.4=4.6, 4÷20=0.2, 3.5×200=700, 1.5-0.06=1.44 0.75÷15=0.05, 0.4×0.8=0.32, 4×0.25=1, 0.36+1.54=2 1...

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