Toán Tính nhanh: a, 12 x 5 + 20 x 2 b, 45 x 2 + 2 × 5 07/09/2021 By Raelynn Tính nhanh: a, 12 x 5 + 20 x 2 b, 45 x 2 + 2 × 5
a, 12 x 5 + 20 x 2
= 60 + 40
= 100
b, 45 x 2 + 2 × 5
= 2 x ( 45 + 5 )
= 2 x 50
= 100
a, 12 x 5 + 20 x 2
= 60 + 40
= 100
b, 45 x 2 + 2 × 5
= 90 + 10
= 100