10.5加x加21等于56
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1/(x+4)+1/(x+7)=1/(x+5)+1/(x+6)1/(x+4)-1/(x+5)=1/(x+6)-1/(x+7)[(x+5)-(x+4)]/[(x+4)(x+5)]=[(x+7)-(x+6
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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
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题在哪
30x+45=30030x=300—4530x=255x=8.5再问:谢谢了
1+x+1=100x2=99xx=2/99
x^2+10x+21=0(x+3)(x+7)=0x+3=0x+7=0解得x1=-3,x2=-7
八十八再答:��л
(x-1)(x+2)(x+3)(x+6)+20=0(x-1)(x+6)(x+2)(x+3)+20=0(x^2+5x-6)(x^2+5x+6)+20=0(x^2+5x)^2-36+20=0(x^2+5x
624
3X+9X+X=26.2613X=26.26X=2.02
x=8,y=15.(诚心为你解答,给个好评吧)
9/(x+8)+21/x=1方程两边同时乘以x(x+8)得到x²+8x=9x+21x+168x²-22x-168=0解得x=28或-6
@44.001
x+1/7x=568/7x=56x=49
(x-y)(x+y)+(x-y)(x+y)=2*(x-y)(x+y)=2(x^2-y^2)=2x^2-2y^2
4+x
7x+7=217x=14x=2