x-8=3-2(x+4)<=>x-8=3-2x-8<=>3x=3<=>x=1
2(x+3)+3(x-1)=2<=>2x+6+3x-3=2<=>5x=5<=>x=1
4(x-5)-3(x-1)=x-19<=>4x-20-3x+3=x-19<=>x=-2
4)7 – ( x – 2) = 5(2x – 3)<=>7-x+2=10x-15<=>11x=22<=>x=2
32 – 4(0,5y – 5) = 3y + 2<=>32-2y+20=3y+2<=>5y=50<=>y=10
3(x – 1) – x = 2x – 3<=>3x-3-x=2x-3<=>0x=0(vô số nghiệm)
x( x – 1) = x(x + 3)<=>x²-x=x²+3x<=>4x=0<=>x=0
8x(2x –3) –x2 + 2 = x(x –5) –1<=>2x²-3x-x²+2=x²-5x-1<=>x=-3/2
(x – 1)(x + 3) = x2 – 4<=>x²-3x-x-3=x²-4<=>4x=4<=>x=1
2)(x – 5) = (x – 3)(x – 4)<=>x²-5x-2x+10=x²-4x-3x+12<=>0x=2(vô nghiệm) ( 6x + 2)(x – 2) = 2x(3x – 5)<=>6x²-12x+2x-4=6x²-10x<=>0x=-4(vô nghiệm)(x – 2)2 = (x – 3)(x + 2)<=>x²-4x+4=x²+2x-3x-6<=>x=10
(x–1)(x +3) – (x+2)(x–3) = 0<=>x²-3x-x-3-x²+3x-2x+6=0<=>-3x=-3<=>x=1
3x – 2)(4x + 3) = 2x(6x – 1)<=>12x²+9x-8x-6=12x²-2x<=>x=6
4x2 – (2x + 1)(2x – 1) = 0<=>4x²-4x²+2x-2x+1=0<=>0x=-1(vô nghiệm)
(x + 3)(x – 2) = (x + 1)2<=>x²-2x+3x-6=x²+2x+1<=>x(x+7)(x–7) + x2 – 2 = 2(x2+5)<=>x²-7x+7x-49+x²-2=2x²+10<=>0x=61(vô nghiệm)
(x–1)2 + (x+3)2 = 2(x– 2)(x+2)<=>x²-2x+1+x²+6x+9=2x²+4x-4x-8<=>0x=-18(vô nghiệm)
(x – 5)2 = (x + 3)2 + 2<=>x²-10x+25=x²+6x+9+2<=>16x=14<=>x=14/16
(3x + 2)2 – (3x – 2)2 = 5x + 38<=>9x²+12x+4-9x²+12x-4=5x+38<=>19x=38<=>x=2
chúc bạn học tốt!!!
