解方程：（1）-7x=2+2x-4 （2)4-2/5x=5/2-x (3)2/5x-4=6+3/5x (4)-2x+1=4x+4
人气：290 ℃ 时间：2019-10-23 14:35:38
解答
（1）-7x=2+2x-4
-9x=-2
x=2/9
（2）4-2/5x=5/2-x
3/5x=-3/2
x=-5/2
（3）2/5x-4=6+3/5x
-1/5x=10
x=-50
（4）-2x+1=4x+4
-6x=3
x=-1/2
推荐
猜你喜欢
- Both the girl and her dog ____ were crossing the street were hit by a coming car.
- 求1*2\1+2*3\1+3*4\1+...+9*10\1的值(要完整计算过程)
- Are the children doing their homework at the moment?的肯定回答 at the moment是什么时态的标志?
- The problem_______ him half an hour to solve last night.A.takes B.took C.cost D.spent
- 用1,2,3,4,5,6,7,8,9,10,12,13编加减乘各一道,数字不重复.
- he found the lost child ____ ___ ___ ___（在……的帮助下）the policeman.
- RUTU,等腰梯形ABCD中,AD‖BC,AB=DC,BC=DC,∠ACD=15°,求梯形各个内角的的度数
- 甲乙两人分别以一定的速度同时从AB两地相向而行,第一次相遇在距离A地200米处,继续前行到
