原式=mn(m+n)2m2n2=m+n2mn.
故答案是m+n2mn.
Zhang Yining did quite _ in the match, but Guo Yue did even . [ ]
A. well; better
B. better; better
C. well; well
D. better; well
石灰熟化后,体积会()。
A.增大两倍
B.缩小1倍
C.不变
D.增大约1~2.5倍