初一数学上册方程题只要方程不要应用题,像1-1/3[x-(1+x)/3]=x/2-1/2[2x-(10-7x)/3]这样的!
2019-04-13
初一数学上册方程题只要方程不要应用题,
像1-1/3[x-(1+x)/3]=x/2-1/2[2x-(10-7x)/3]这样的!
优质解答
1/(x-10)+1/(x-6)=1/(x-7)+1/(x-9)
1/(x-10)-1/(x-9)=1/(x-7)-1/(x-6)
[(x-9)-(x-10)]/(x-10)(x-9)=[(x-6)-(x-7)]/(x-7)(x-6)
即是
1/（x-9)(x-10)=1/(x-6)(x-7)
x^2-13x+42=x^2-19x+90
6x=68
得出：x=8
经检验,X=8是方程的解
1/(x-10)+1/(x-6)=1/(x-7)+1/(x-9)
1/(x-10)-1/(x-9)=1/(x-7)-1/(x-6)
[(x-9)-(x-10)]/(x-10)(x-9)=[(x-6)-(x-7)]/(x-7)(x-6)
即是
1/（x-9)(x-10)=1/(x-6)(x-7)
x^2-13x+42=x^2-19x+90
6x=68
得出：x=8
经检验,X=8是方程的解