7x-2x=63的解方程
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x(x-3)=6-2xx²-3x=6-2xx²-x-6=0(x-3)(x+2)=0x1=3x2=-2
7x-2x=105x=10x=10÷5x=2
7/x-2x/x=5/x7-2x=5x=1再问:方程7/x-2=5/x的解是?再答:首先等号左边通分7/x-2x/x然后等式两边同乘x7-2x=5还有什么不明白的吗?
x(x^2-2)+2x^2(x+3)-3x(5x-7)=x(3x^2-9x+17)+2=>x^3-2x+2x^3+6x^2-15x^2+21x=3x^3-9x^2+17x+2=>2x=2x=1
(x²-x+4)x-(x-1)(x²+2)=x+7x³-x²+4x-x³+x²-2x+2=x+72x+2=x+72x-x=7-2x=5
【解法一】【解法二】5x(x+7)(x+4)=5x(x^2+11X)5x(x²+11x+28)-5x(x²+11x)=05x^3+55x^2+140x=5x^3+55x^25x(x
-7x+4=2x-4移项-7x-2x=-4-4合并同类项得-9x=-8系数化为一得x=8/98/9就是9分之8
4/5x-2/7x=x+2/7x-46移项x+2/7x+2/7x-4/5x=46(1+2/7+2/7-4/5)x=4627/35x=46x=46÷27/35x=59又17/27
7x-x/2=0.786.5x=0.78x=0.12
5X=6363➗5再答:12.6
2x²-7x=0x²-7/2+49/16=49/16(x-7/4)²=49/16x-7/4=+,—7/4x=0,x=7/8
7x^2+2x=0x﹙7x+2﹚=0∴x=0或﹙7x+2﹚=0∴x1=0x2=-2/7
5X=63X=12.6
(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)(x+2-1)/(x+2)+(x+7-1)/(x+7)=(x+3-1)/(x+3)+(x+6-1)/(x+
2(x-3)(x+5)=x^2+(x+2)(x-2)+(x+7)2(x^2+2x-15)=x^2+x^2-4+x+72x^2+4x-30=2x^2+x+33x=33x=11
x+62/x+63+x+68/x+69=x+63/x+64+x+67/x+68可以把x+62看做x解得x=-4所以x+62=-4x=-66
寒樱暖暖为你7X-14=2X7X-2X=145X=14X=14/5(或在客户端右上角评价点【满意】)是我前进的动力!也会给你带去财富值的.如有不明白,直到完成弄懂此题!再问:那接下来的步骤呢??再答: