化简求值1.3(m+1)^2-5(m+1)(m-1)+2m(m-1),其中m=5
问题描述:
化简求值1.3(m+1)^2-5(m+1)(m-1)+2m(m-1),其中m=5
要写出过程,一定要仔细哦!准确!……
化简求值
1.3(m+1)^2-5(m+1)(m-1)+2m(m-1),其中m=5
2.2(x+4)^2-(-x-5)^2-(x+3)(x-3),其中x=-2
3.((x+y)分之1-(x-y)分之1 )÷(x^2-2xy+y^2)分之2x
1.3(m+1)^2-5(m+1)(m-1)+2m(m-1),其中m=5
2.2(x+4)^2-(-x-5)^2-(x+3)(x-3),其中x=-2
3.((x+y)分之1-(x-y)分之1 )÷(x^2-2xy+y^2)分之2x 其中x=2 y=-1
答
1.3(m+1)^2-5(m+1)(m-1)+2m(m-1)=3m^2+6m+3-5m^2+5+2m^2-2m=4m+8=2(m+2)=2(5+2)=142.2(x+4)^2-(-x-5)^2-(x+3)(x-3)=2x^2+16x+32-x^2-10x-25-x^2+9=6x+16=6*(-2)+16=43.[1/(x+y)-1/(x-y)]÷2x/(x^2-2xy+y^2)={...