计算题.m²-4n²分之m²-mn÷m²-2mn分之m-n.2x分之5x-3÷3分之25x²-9×x分之5x+3.x﹙3a+2﹚分之5a+b×25a²-b²分之4x²-9a²x².
问题描述:
计算题.m²-4n²分之m²-mn÷m²-2mn分之m-n.
2x分之5x-3÷3分之25x²-9×x分之5x+3.
x﹙3a+2﹚分之5a+b×25a²-b²分之4x²-9a²x².
答
m²-4n²分之m²-mn÷m²-2mn分之m-n=m(m-n)/(m+2n)(m-2n)×m(m-2n)/(m-n)=m²/(m+2n) 2x分之5x-3÷3分之25x²-9×x分之5x+3.=(5x-3)/2x×3/(5x+3)(5x-3)×(5x+3)/x=3/2x²x﹙3a...