13 x 27 + 13 x 70 + 13 x 4 - 13 = 13(27+70+4-1) = 13 x 100 = 1300
Tính nhanh: 13×27+13×70+13×4–13
=13x27+13x70+13x4-13x1
=13x(27+70+4-1)
=13x 100
= 1300
13 x 27 + 13 x 70 + 13 x 4 - 13 = 13 x (27 + 70 + 4 - 1) = 13 x 100 = 1300
13 x 27+13x70+13x4-13
=13x27+13x70+13x4-13x1
=13x(27+70+4-1)
=13x100=1300
13x27+13x70+13x4-13
=13x(27+70+4-1)
=13x 100
=1300
nha