1.
2x/5x²y-y/10xy²
=2/5xy-1/10xy
=3/10xy
2.3/2ab+1/4a²
=6a/4a²b+b/4a²b
=(6a+b)/4a²b
3.1/ab²+5/3a²c
=3ac/3a²b²c+5b²/3a²b²c
=(3ac+5b²)/3a²b²c
4.x/2y-2/3xy²
=3x²y/6xy²-4/6xy²
=(3x²y-4)/6xy²
如果不懂,请追问,祝学习愉快!
1.
2x/5x²y-y/10xy²
=2/5xy-1/10xy
=3/10xy
2.3/2ab+1/4a²
=6a/4a²b+b/4a²b
=(6a+b)/4a²b
3.1/ab²+5/3a²c
=3ac/3a²b²c+5b²/3a²b²c
=(3ac+5b²)/3a²b²c
4.x/2y-2/3xy²
=3x²y/6xy²-4/6xy²
=(3x²y-4)/6xy²
如果不懂,请追问,祝学习愉快!