x(1+0.2)+(1500一x)(1一0.3)=1600

|x一2|+1 一.6（x-1 计算:|3一x|+|x一1|(x>5) 计算:/3一x/十/x一1/(x>5) x(1+0.2)+(1500一x)(1一0.3)=1600 {x一3(X一1)≤7,1一3分之2一5X x一2分之1一x=3一3分之x一2 4(2X一9)+3(X一15)=7(X一1)一2 若x(x一1)一(x^2一y)=一2,求多项式 0.2分之(0.1一x)一0.03分之(0.02一0.1x)=1 0.2分之(0.1一x)一0.03分之(0.02一0.1x)=1求解 4(2x一7)一2(x一1)=3(x一1)一2 x=? 计算：(2x一1)^2一(x^5一4x^4)÷x^3 解方程:2x(x一1)一x(2x一5)=12 求(X+1)(X一2) 解x(x一1)=132, 2x一1/2=x/2一1 因式分解3x^2一5x一1