x÷2十20=75%x

x÷2十20=75%x X.(X十1)x(X十2)x(x十3) =360 已知1十x十x^2 十x^3=0,求x十x^2十x^3十x^4+x^5十x^6+x^7十x^8的值 5x十2x=42 15十2x一3=48 2x十3x十17=37 6x一3x=6÷5 9x一2x=15x十2x=4215十2x一3=482x十3x十17=376x一3x=6÷59x一2x=1.4十0.077(2x一6)=15.4 怎样计算“x十x÷3十2x一30=180” (x十2)÷0.8=12.5 (x十3)÷2=7.5 2（X十3.5）=20 (x十 2)x2=20 2x十8十3x十8十4x十8=?请算出这道题目求士寸佰了⑥ x^2十2x十1=4 2(x十3)=3(0.5x十10) x^2十5x十10700=12000 2X十3÷8X=28 x十75%x=3.5 2x十(7一x)x4=20 7x十2(3x-3)=20 7x十2(3x一3)=20