7.3-0.7X=2.1-2X

7.3-0.7X=2.1-2X f(x)=x^2+x (x 五年级数学计算题（直接写得数就可以了,要按顺序写.）3.6x+4.8X ,2.1b+8.9b ,1.2a-0.3a,x-0.2X ,5.4x-3.2x ,9x-1.5x ,a+0.7a ,130x-76x ,7.3m-7m ,9.6a+a ,10x=3.2x ,x+4.8x. x-o.8x=6 12x-8x=4.8 3x-8=16 7.5x-2x x-0.7x=3.6 求答案 x^2=x x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, 1.(x*2-3x+3)/(x*2-3x+2)-(x*2-5x+7)/(x*2-5x+6)-1/(x*2-4x+3)2.1/x(x+1)+2/(x+1)(x+3)+3/(x+3)(x+6) 3.已知：x*2-3x+1=0,求x*2+1/x*2. x/x平方-x+2=2x/x+1 f(x)=x|x|+2x (x (X+1)X(X+2)X(X+3)=504 4x+1.2×5＝24.4 x-0.7x=2.1 8x+5x=2.6 （4x+5）÷2=4x+1.2×5＝24.4 x-0.7x=2.18x+5x=2.6 （4x+5）÷2=17.52x-16=24 2x^2+0.7x-0.15=0 x=? 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 0.6+3X=2.1-2X x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 1.6x+2x*0.7=18 2x(x-0.7)=4.