4x(1–x)=1 4x-4x^2-1=04x^2-4x+1=0(2x-1)^2=02x-1=0x=1/2

2(x-2)-3(4x-1)=9(1-x) 11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x) 3(x-7)-2[9-4(2-x)]=22 3/2[2/3(1/4x-1)-2]-x=2 2(x-2)+2=x+1 5x^2+3x+1=0 7x^2+x+12=0 2x^2+4x+4=0 8x^2+3x+1=0.

(2x+3)^2=812x+3=92x=6x=32x+3=-92x=-12x=-6

直接开平方法例:解方程(3x+1)2=7;(3x+1)2=7;∴(3x+1)2=7;∴3x+1=±√7(注意不要丢解符号);∴x=﹙﹣1±√7﹚/3.

4x-2=104x=10+2=12x=12/4=3

解: 4ⅹ-ⅹ=30 3ⅹ=30 ⅹ=10

x方+4x=1 x^2+4x+4=5 (x+2)^2=5 x+2=±根号5 x=±根号5-2

4x(1-x)=1解:4x-4x²-1=04x²-4x+1=0(2x-1)²=02x-1=02x=1x=1/2

解 4x+1=94x+1-1=9-14x=8 x=8÷4 x=2

4x÷1/4=5/64x*4=5/616x=5/6 x=5/96