Question

20 + 30 + 60 + 80 + 70 + 40

Answer 1

\(20+30+60+80+70+40\)

 \(=\left(20+80\right)+\left(30+70\right)+\left(60+40\right)\)

\(=100+100+100\)

 \(=300\)

Answer 2

20 + 30 + 60 + 80 + 70 + 40

= (20 + 80) + (30 + 70) + (60 + 40)

=      100 + 100 + 100

=          300

Answer 3

20 + 30 + 60 + 80 + 70 + 40 = ( 20 + 80 ) + ( 30 + 70 ) + ( 60 + 40 )

                                          = 100 + 100 + 100

                                          = 300

Answer 4

=[20+80] +[60+40]+[30+70]

=100+100+100

=300

Answer 5

20 + 30 + 60 + 80 + 70 + 40

= ( 20 + 80 ) + ( 30 + 70 ) + ( 60 + 40 )

= 100 + 100 + 100

= 200 + 100

= 300

Nhớ k cho mk nha

Answer 6

kết quả là 300

Answer 7

 20+30+60+80+70+40

=(20+80)+(30+70)+(60+40)

=   100   +   100   +  100

=  300