2a的2次方+1-3a+7-3a的二次方+5a加步骤 3a-4b+5a-2b 查看详细>>

问题描述:

2a的2次方+1-3a+7-3a的二次方+5a加步骤 3a-4b+5a-2b 查看详细>>

2a^2+1-3a+7-3a^2+5a
=2a^2-3a^2-3a+5a+1+7
=-a^2+2a+8
3a-4b+5a-2b
=3a+5a-4b-2b
=8a-6b