Question

Tính nhanh:20+45+30+80+70+55=?

Answer 1

20+45+30+80+70+55

=(20+80)+(30+70)+(45+55)

=100+100+100

=100x3

=300

Answer 2

20 + 45 + 30 + 80 + 70 + 55

= ( 20 + 80 ) + ( 45 + 55 ) + ( 30 + 70 )

= 100 + 100 + 100

= 300

Answer 3

20+45+30+80+70+55

= (20+80)+(45+55)+(30+70)

= 100+100+100

=100x3

=300

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Answer 4

Tính nhanh:20+45+30+80+70+55=?

= ( 80 +20 ) +(45 + 55 ) + ( 70 +30 )

= 100 + 100 + 100

= 300