1、345×998(简算,2、5/8+1又7/10-0.4-0.7(简算,3、0.75×14又1/9+3/4×1又8/9-12×75%(简算,4、[(10-1÷25)÷9.6]×0.01(脱式计算,5、x-1/2x-1=4/9(解方程,

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1、345×998(简算,2、5/8+1又7/10-0.4-0.7(简算,3、0.75×14又1/9+3/4×1又8/9-12×75%(简算,4、[(10-1÷25)÷9.6]×0.01(脱式计算,5

1、345×998(简算,2、5/8+1又7/10-0.4-0.7(简算,3、0.75×14又1/9+3/4×1又8/9-12×75%(简算,4、[(10-1÷25)÷9.6]×0.01(脱式计算,5、x-1/2x-1=4/9(解方程,
1、345×998(简算,
2、5/8+1又7/10-0.4-0.7(简算,
3、0.75×14又1/9+3/4×1又8/9-12×75%(简算,
4、[(10-1÷25)÷9.6]×0.01(脱式计算,
5、x-1/2x-1=4/9(解方程,

1、345×998(简算,2、5/8+1又7/10-0.4-0.7(简算,3、0.75×14又1/9+3/4×1又8/9-12×75%(简算,4、[(10-1÷25)÷9.6]×0.01(脱式计算,5、x-1/2x-1=4/9(解方程,
1 345*1000-345*2等于345000-690等于344310
2 (0.625-0.4)+(1.7-0.7)等于0.225+1等于0.225
3 原式=3/4×14又1/9+3/4×1又8/9-12×3/4=3/4×(14又1/9+1又8/9-12)=3/4×4=3
4前边是10.1还是10—1 看不清楚
5 x-1/2x-1=4/9
1/2x-1=4/9
1/2x=13/9
x=26/9

可怜的娃,题偶们都会,但这也太难打了吧!分还这么低.........

我都不知道你在说什么 又是什么

1、345*1000-345*2等于345000-690等于344310
2、(0.625-0.4)+(1.7-0.7)等于0.225+1等于0.225
3、

分也太少了吧 ,给多点分,我都会

1、345×998
=345×(1000-2)
=345×1000-345×2
=345000-690
=344310

2、5/8+1又7/10-0.4-0.7
=5/8-2/5(就是0.4)+(17/10(就是1又7/10)-7/10(就是0.7))
=7/40+1
=1又7/40
3、0.75×14又1/9+3...

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1、345×998
=345×(1000-2)
=345×1000-345×2
=345000-690
=344310

2、5/8+1又7/10-0.4-0.7
=5/8-2/5(就是0.4)+(17/10(就是1又7/10)-7/10(就是0.7))
=7/40+1
=1又7/40
3、0.75×14又1/9+3/4×1又8/9-12×75%
=0.75×127/9+0.75×17/9-12×0.75
=0.75×(127/9+17/9-12)
=0.75×4
=3
4、[(10-1÷25)÷9.6]×0.01
=[9.96÷9.6]×0.01
=1.0375×0.01
=0.010375
5、 x-1/2x-1=4/9
(1-1/2)x-1=4/9
1/2x-1=4/9
1/2x=13/9
x=26/9
望采纳,谢谢!

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