2 câu trả lời
a, 12 x 5 + 20 x 2
12 x 5 + 20 x 2
= 12 x 5 + 40
= 12 x 5 + 5 x 8
= 5 x ( 12 + 8 )
= 5 x 20
= 100
b, 45 x 2 + 2 x 5
= 2 x (45 + 5)
= 2 x 50
= 100
a, 12 x 5 + 20 x 2
12 x 5 + 20 x 2
= 12 x 5 + 40
= 12 x 5 + 5 x 8
= 5 x ( 12 + 8 )
= 5 x 20
= 100
b, 45 x 2 + 2 x 5
= 2 x (45 + 5)
= 2 x 50
= 100