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解方程:x/(x%2)+(x%9)/(x%7)=(x+1)/(x%1...

解: x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6) 因为x/x-2=(x-2+2)/x-2=1+2/x-2.其他类似。 即 1+2/(x-2)+1-2/(x-7)=1+2/(x-1)+1-2/(x-6) 1/(x-2)-1/(x-7)=1/(x-1)-1/(x-6) 可得-5/(x-2)(x-7)=-5/(x-1)(x-6) (x-2)(x-7)=(x-1)(x-6) 化简...

解: x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6) 1+2/(x-2)+1-2/(x-7)=1+2/(x-1)+1-2/(x-6) 1/(x-2)-1/(x-7)=1/(x-1)-1/(x-6) 1/(x-2)+1/(x-6)=1/(x-1)+1/(x-7) (2x-8)/(x^2-8x+12)=(2x-8)/(x^2-8x+7) 由于x^2-8x+12不等于x^2-8x+7 因此,只...

x-=7X3 Xx2=21 X=21+2 X=23

2(x²+1)/X+1+6(x+1)/x²+1=7 [2(x²+1)/x+1]+[6(x+1)/ (x²+1)]=7 解:设:令u=(x²+1)/(x+1), 则,原式可化为 2u+6/u=7, 2 u²-7u+6=0, 则:(2u-3)(u-2)=0 则u1=3/2, u2=2 将“u=(x²+1)/(x+1)”代入“u1=3/2”...

(x-6)/(x-7)+1/(7-x)=8 解:(x-6)/(x-7)-1/(x-7)=8 两边同时乘以x-7,得 x-6-1=8(x-7) x-7=8x-56 7x=56-7 7x=49 x=7 题目有问题?

x乘(x+1)乘(x+2)=504 x(x+1)(x+2)=504 x(x+1)(x+2)=7×8×9 x=7

太懒了吧,小学的通分问题

(x-4)/(x-5) + (x-8)/(x-9) = (x-5)/(x-6) + (x-7)/(x-8) (x-5+1)/(x-5) + (x-9+1)/(x-9) = (x-6+1)/(x-6) + (x-8+1)/(x-8) 1+1/(x-5) + 1+1/(x-9) = 1+1/(x-6) + 1+1/(x-8) 1/(x-5) + 1/(x-9) = 1/(x-6) + 1/(x-8) 1/(x-9) - 1/(x-8) = 1/(x-6)...

因为结果是整数,分子同是一个未知数减去一个整数,分母又是3、5、7、9、11这样的奇数,那么每一项都是整数,又x-2既是3的倍数又是7的倍数,那么x-2最小为21,其次42,若x-2=42,那么(x-2)/3=14,(x-2)/7=6,这两者相加已经大于18,故x-2=21...

3x+10=4(x-2)+7 解: 3x+10=4x-8+7 4x-3x=10+8-7 x=11 6(x+1)=9(x-1) 解: 6x+6=9x-9 9x-6x=6+9 3x=15 x=5

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