解方程9(x-1)²=16(x+2)²
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解方程9(x-1)²=16(x+2)²
解方程9(x-1)²=16(x+2)²
解方程9(x-1)²=16(x+2)²
9(x-1)²=16(x+2)²
9(x-1)²-16(x+2)²=0
[3(x-1)-4(x+2)][3(x-1)+4(x+2)]=0
(3x-3-4x-8)(3x-3+4x+8)=0
-(x+11)(7x+5)=0
x=-11或x=-5/7
不知是否弄巧成拙了
9x2-18x+9=16x2+64x+64
7x2+82x+55=0
(7x+5)(x+11)=0
x1=-5/7
x2=-11
(x-1)/(x+2)=4/3然后就简单!要学会化简,还要注意分母为0的情况1
X=-11,X=-5/7
hfdh
9(x-1)²=16(x+2)²
9(x-1)²-16(x+2)²=0
[3(x-1)-4(x+2)][3(x-1)+4(x+2)]=0
-(x+11)(7x+5)=0
x=-11或者x=-5/7
3(x-1)=4(x+2)或3(x-1)=-4(x+2)
9(x-1)²=16(x+2)²
9(x-1)²-16(x+2)²=0
[3(x-1)-4(x+2)][3(x-1)+4(x+2)]=0
(3x-3-4x-8)(3x-3+4x+8)=0
-(x+11)(7x+5)=0
x=-11或x=-5/7 注意x不为1和-2