1.方程ax+c=-2x+4 2.1/2{x-1/2(x-1)}=2/3(x-1)3.2{3/4x-(2/3x-1)}=5/6-3 就这三道题..
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1.方程ax+c=-2x+4 2.1/2{x-1/2(x-1)}=2/3(x-1)3.2{3/4x-(2/3x-1)}=5/6-3 就这三道题..
1.方程ax+c=-2x+4 2.1/2{x-1/2(x-1)}=2/3(x-1)3.2{3/4x-(2/3x-1)}=5/6-3 就这三道题..
1.方程ax+c=-2x+4 2.1/2{x-1/2(x-1)}=2/3(x-1)3.2{3/4x-(2/3x-1)}=5/6-3 就这三道题..
1.方程ax+c=-2x+4
ax+2x=4 -c
(a+2)x=4-c
当a≠-2时,x=(4-c)/(a+2)
2.1/2{x-1/2(x-1)}=2/3(x-1)
x/2-x/4+1/4=2x/3-2/3
6x-3x+3=8x-8
-5x=-11
x=11/5
3.2{3/4x-(2/3x-1)}=5/6-3
3x/2-4x/3+2=5/6-3
9x-8x+12=5-18
x=-25
ax+c=-2x+4 ax+2x=4-c (a+2)x=4-c x=(4-c)/(a+2) 1/2{x-1/2(x-1)}=2/3(x-1) 1/2(x-1/2x+1/2)=2x/3-2/3 x/4+1/4=2x/3-2/3 3x+3=8x-8 5x=11 x=11/5 2{3/4x-(2/3x-1)}=5/6-3 2(3/4x-2/3x+1)=5/6-3 3/2x-4/3x+2=5/6-3 9-8+12x=10x-18x 20x=-1 x=-1/20
第一题你题目错了吧?2,x1=1,x2=11/3 3、x=-1/25第二题把x-1看做未知数t再代入,第三题把3/4x=9/12x,2/3x=8/12x就行了……