1. 2x²+4xy+2y²/x²-xy+2y²=2(x+y) /___________
2. a²-3ab+b²/ab=(__________/ab)-3
3. 3x²-xy/9x²-6xy+y²=x/___________=_________/9x²-y²
1. 2x²+4xy+2y²/x²-xy+2y²=2(x+y) /___________
2. a²-3ab+b²/ab=(__________/ab)-3
3. 3x²-xy/9x²-6xy+y²=x/___________=_________/9x²-y²
七年级?