7x加45等于560
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7X=2X-1+47X-2X=35X=3X=3/5
X加8分之7X等于428X+7X=33615X=336X=22.4
7x-8x=27+8-x=35x=-35
1/(x+5)-1/(x+6)=1/(x+7)+1/(x+8)1/(x+5)-1/(x+7)=1/(x+8)-1/(x+6)2/(x+5)(x+7)=2/(x+8)(x+6)(x+5)(x+7)=(x
2x^2-7x+3=0分解因式(x-3)(2x-1)=0所以x=1/2或x=3或者用公式法△=49-4×2×3=25x=(7+5)/4=3或x=(7-5)/4=1/2所以x=1/2或x=3
x+(1/x)=根7等式两边同时平方.可得到:x^2+(1/x^2)+2*x*(1/x)=7那么可以得到:x^2+(1/x^2)=7-2*x*(1/x)=7-2=5
3x+7=32-2x5x=25x=5
X=135
6x²-7x+1=0(x-1)(6x-1)=0x=1,x=1/6再问:能详细一点吗谢谢再答:6x^2-6x-x+1=06x(x-1)-(x-1)=0(x-1)(6x-1)=0
x/5+x=326x/5=32x=80/32x/5-x/4=243x/20=24x=16030%x=45x=4500/30=150X+12%X=2.241.12x=2.24x=2
x^2+x+1=5x^2+x=4(7-x)(8+x)=56-x-x^2=56-(x^2+x)=56-4=52
4x+5x=459x=45x=45÷9x=5
x/(10/7)=0.4x+127/10x=4/10x+127/10x-4/10x=123/10=12x=12*10/3x=40
7x+5.9=2x-3.67x-2x=-5.9-3.65x=-9.5x=-9.5/5x=-1.9
2x²+3=7x2x²-7x+3=0(x-3)(2x-1)=0x1=3,x2=1/2
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再答:望采纳,祝学习进步
(x+8)/(x+7)+(x+9)/(x+8)=(x+7)/(x+6)+(x+10)/(x+9)(x+8)/(x+7)-(x+7)/(x+6)=(x+10)/(x+9)-(x+9)/(x+8)1+1/