(278+352-10)-(278+352-20)

2 câu trả lời

XàPhòng

(278+352-10)-(278+352-20)

=(630-10)-(630-20)

=630-10-630+20

=(630-630)+(-10+20)

=0+10

=10 

(278+352-10)-(278+352-20)

=278+352-10-278-352+20

=(278-278)+(352-352)+(-10+20)

=0+0+10

=10