解方程:(1)4x=3x+5 (2)1/2x-7=3 (3)4x-7=6x+9 (4)3(x-5)=-21

问题描述:

解方程:(1)4x=3x+5 (2)1/2x-7=3 (3)4x-7=6x+9 (4)3(x-5)=-21
(5)1+2x/2=2-1+x/4 (6)2x-1/0.7=x/0.3-1/7 (7)5-6(5/6-x-1/3)=2(x-3/4)

(1)4x=3x+5 4x-3x=5 x=5(2)1/2x-7=3 1/2x=10 x=20(3)4x-7=6x+9 -7-9=6x-4x x=-8(4)3(x-5)=-21 x-5=-7 x=-2(5)1+2x/2=2-1+x/4 1+x=1+x/4 x=0(6)2x-1/0.7=x/0.3-1/7 -4/3x=9/7 x=-27/28(7)5-6(5/6-x-...