ass1976
幼苗
共回答了17个问题采纳率:82.4% 举报
M+N=(5a的平方-3ab+2b的平方)+(4a的平方-3ab)
=5a²-3ab+2b²+4a²-3ab
=9a²-6ab+2b²
M+P=(5a的平方-3ab+2b的平方)+(a的平方+5ab)
=5a²-3ab+2b²+a²+5ab
=6a²+2ab+2b²
M-N=(5a的平方-3ab+2b的平方)-(4a的平方-3ab)
=5a²-3ab+2b²-4a²+3ab
=a²+2b²
M-P=(5a的平方-3ab+2b的平方)-(a的平方+5ab)
=5a²-3ab+2b²-a²-5ab
=4a²-8ab+2b²
1年前
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