Question

4.51.7+2.86.7+12.2.7

Answer 1

=2*2*51*7+2*2*7*43+2*2*7*6

=2*2*7*(51+43+6)

=28*100

=2800

Lưu ý: * là dấu nhân

Ok Chúc bạn học tốt

Answer 2

2800

Answer 3

4.51.7+2.86.7+12.2.7

=1428+1204+168

=2800

Answer 4

\(4.51.7+2.86.7+12.2.7=14\left(2.51+86+12\right)=14.200=2800\)

Answer 5

4.51.7+2.86.7+12.2.7

= 2 x 2 x 51 x 7+2 x 2 x 7 x 43+2 x 2 x 7 x 6

=2 x 2 x 7 x (51+43+6)

=28 x 100

=2800

Answer 6

..................2800