2 câu trả lời
a, 12 x 5 + 20 x 2
= 12 x 5 + 5 x 4 x 2
= 5 x (12 + 8)
= 5 x 20
= 100
b, 45 x 2 + 2 × 5
= 2 x ( 45 + 5 )
= 2 x 50
= 100
hok tốt
a, 12 x 5 + 20 x 2
= 12 x 5 + 5 x 4 x 2
= 12 x 5 + 5 x 8
= 5 x (12 + 8)
= 5 x 20
= 100
b, 45 x 2 + 2 × 5
= 2 x (45 + 5)
= 2 x 50
= 100