3/4x(84一x)=1/2x+18

3/4x(84一x)=1/2x+18 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X 2x一1/3(x+1)=4x一(2X十1/2) 4(2x一7)一2(x一1)=3(x一1)一2 x=? 4(2X一9)+3(X一15)=7(X一1)一2 一| x^2-3x-4|>x+1 二| x^2-2x-3|>x-2 解方程与不等式：(1)(x一3)(x一2)+18=(x+9)(x+1)； (2)(3x+4)(3x一4)＜9(x一2)(x+3)． *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 3（x+2）一4（x一1）+2（3x一1）一18=0 一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X (3X平方一2)一(4X平方一2X一3)十(2X平方一1)其中X=一2 计算：(2x一1)^2一(x^5一4x^4)÷x^3 5X一18=3-2X X=? 4X+2=5X一1 X=? (1)3X十6X一5=0 (2)4X一X一9=0, 解方程 式子 6-2x+3x=3x-4x+3x+18 6-x+3x=2x-5x+1 2x-1=5x-36-2x+3x=3x-4x+3x+18 6-x+3x=2x-5x+12x-1=5x-3 (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x