分式计算:x^2+2x+1分之x+1÷2x+2分之x+32.(2x+2y分之x-y)-(x^2-y^2分之x^2+y^2)3.x^2+4x+4分之x^2-1÷(x+1)*x-1分之x^2+3x+24.(m+n)(m-n)-2(m-n)^2
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 10:24:21
![分式计算:x^2+2x+1分之x+1÷2x+2分之x+32.(2x+2y分之x-y)-(x^2-y^2分之x^2+y^2)3.x^2+4x+4分之x^2-1÷(x+1)*x-1分之x^2+3x+24.(m+n)(m-n)-2(m-n)^2](/uploads/image/z/6898532-68-2.jpg?t=%E5%88%86%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%9Ax%5E2%2B2x%2B1%E5%88%86%E4%B9%8Bx%2B1%C3%B72x%2B2%E5%88%86%E4%B9%8Bx%2B32.%282x%2B2y%E5%88%86%E4%B9%8Bx-y%29-%28x%5E2-y%5E2%E5%88%86%E4%B9%8Bx%5E2%2By%5E2%293.x%5E2%2B4x%2B4%E5%88%86%E4%B9%8Bx%5E2-1%C3%B7%28x%2B1%29%2Ax-1%E5%88%86%E4%B9%8Bx%5E2%2B3x%2B24.%28m%2Bn%29%28m-n%29-2%28m-n%29%5E2)
分式计算:x^2+2x+1分之x+1÷2x+2分之x+32.(2x+2y分之x-y)-(x^2-y^2分之x^2+y^2)3.x^2+4x+4分之x^2-1÷(x+1)*x-1分之x^2+3x+24.(m+n)(m-n)-2(m-n)^2
分式计算:x^2+2x+1分之x+1÷2x+2分之x+3
2.(2x+2y分之x-y)-(x^2-y^2分之x^2+y^2)
3.x^2+4x+4分之x^2-1÷(x+1)*x-1分之x^2+3x+2
4.(m+n)(m-n)-2(m-n)^2
分式计算:x^2+2x+1分之x+1÷2x+2分之x+32.(2x+2y分之x-y)-(x^2-y^2分之x^2+y^2)3.x^2+4x+4分之x^2-1÷(x+1)*x-1分之x^2+3x+24.(m+n)(m-n)-2(m-n)^2
x^2+2x+1分之x+1÷2x+2分之x+3
=(x+1)/(x+1)²×2(x+1)/(x+3)
=2/(x+3)
2.(2x+2y分之x-y)-(x^2-y^2分之x^2+y^2)
=(x-y)/2(x+y)-(x²+y²)/(x+y)(x-y)
=[(x-y)²-2(x²+y²)]/2(x+y)(x-y)]
=-(x²+2xy+y²)/2(x+y)(x-y)
=-(x+y)²/2(x+y)(x-y)
=(x+y)/(2y-2x)
3.x^2+4x+4分之x^2-1÷(x+1)*x-1分之x^2+3x+2
=(x+1)(x-1)/(x+2)²×1/(x+1)×(x+1)(x+2)/(x-1)
=(x+1)/(x+2)
4.(m+n)(m-n)-2(m-n)^2
=m²-n²-2(m²-2mn+n²)
=-m²+4mn-3n²
有问题再求助