Question

4a^2+7a-3与3a^2-6a+5的和是____,差是_____.

Answer 1

4a^2+7a-3与3a^2-6a+5的和是7a^2+a+2

,差是a^2+13a-8

4a^2+7a-3+3a^2-6a+5=7a^2+a+2

4a^2+7a-3-3a^2+6a-5=a^2+13a-8