3.14x÷2+x=5.14 3.14x(÷2+1)=5.14为什么可以这样算

2X+3.14X=? 一元二次方程 （3.14×2x÷4）＋x＋（3.14x²÷x）＋（3.14x²÷x－x）=15.7 化简 [3x/(x+2)-x/(x=2)]÷x/(x^2-4)化简 [3x/(x+2)-x/(x-2)]÷x/(x^2-4 128.5-2x=3.14x+2x 3.14*（0.5x)(0.5x)*2x=50 x+x÷3.14=41.4 3.14*2x=2（x+6. 20.7-2x=3.14x 2*3.14x*x=6.28 3.14x=20.56-2x x×3.14×2+x=5210 x×x×3.14=12.56 28.24-x=3.14x 设f(x)=x+2÷x(x f(x)=x^2+x (x (x²-x+1)÷(x²-x-1)=(x²+x)÷(x²+x-2)解方程 X^2-3X-2=0,求( x - 2x-1/x )÷(x-1)/(x^2-2x) 3.14x÷2+x=5.14 3.14x(÷2+1)=5.14为什么可以这样算