4a+3a-2a=?2b-b+0.5b=?10x-(7x+x)=?6x-1.5x=?8x+4x-8x=?7.5x-x+2.5=?5x-(3x-2.4x)=?

4a+3a-2a=?2b-b+0.5b=?10x-(7x+x)=?6x-1.5x=?8x+4x-8x=?7.5x-x+2.5=?5x-(3x-2.4x)=?
4a+3a-2a=?2b-b+0.5b=?10x-(7x+x)=?6x-1.5x=?8x+4x-8x=?7.5x-x+2.5=?5x-(3x-2.4x)=?

4a+3a-2a=?2b-b+0.5b=?10x-(7x+x)=?6x-1.5x=?8x+4x-8x=?7.5x-x+2.5=?5x-(3x-2.4x)=?
4a+3a-2a=5a
2b-b+0.5b=1.5b
10x-(7x+x)=2x
6x-1.5x=4.5x
8x+4x-8x=4x
7.5x-x+2.5=6.5x+2.5
5x-(3x-2.4x)=4.4x

4a+3a-2a=5a 2b-b+0.5b=1.5b 10x-(7x+x)=2x 6x-1.5x=4.5x 8x+4x-8x=4x 7.5x-x+2.5=4x+2.5 5x-(3x-2.4x)=4.8x

这个按加减法算就可以了……

小学生上来写作业的？