0.25*(2/X)=2.5
解方程:2x^2=3x+2;0.25X^2+2.5x-6=0;(x+2)^2=6x+7;x^2-2根号3x-6=0
2(x+1)-(3-x)=2(1.5x-2.5)
4-x=2(-0.5x²+2.5x-2)
【1】2x+2.5x+1.5x=5
2.5X+2.5(X+2)=55
19.8x+0.2x=2.5×2
解方程X-0.5X=15 X-0.8X=10 2.5X+2X=9
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
x+17=3(x+13),2x-11.2=0.6x,2.5x-2.17=21.9-5.8x,8(x-1.5)=x+0.6
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
解方程3x=x+4,2.6x-8=2.4x,4x+12=10x+3 ,7x=12-×,2.5x=2x+4,5x+3=6x
x/x平方-x+2=2x/x+1