Bài 1 thôi nhé chị lười
a)3x-2x=-3x+2<=>x=1
b)2x-5x=9-3<=>-3x=6<=>x=-2
c)2x=-2<=>x=-1
d)10x-5x-4x=12-3<=>x=9
e)11x-2x+9x=100-22-42<=>18x=35<=>x=2
f)2x-3+5x=4x+12<=>2x+5x-4x=12+3<=>3x=15<=>x=5
g)x²+2x=x²+3x<=>x²-x²+2x-3x=0<=>x=0
h)2x-6+5x²-5x=5x²<=>2x-6+5x²-5x-5x²=0<=>2x-6-5x=0<=>-3x-6=0<=>-3x=6<=>x=-2