Question

tính cách nhanh

(36+54)x7+7x9+7

Answer 1

\(=90\times7+7\times9+7\)

\(=7\times\left(90+9+1\right)\)

\(=7\times100=700\)

Answer 2

 (36 + 54) x 7 + 7 x 9 + 7

= 90 x 7 + 7 x 9 + 7 x 1 

= 7 x ( 90 + 9 +1) 

= 7 x 100

= 700

Answer 3

\(=7\times\left(36+54+9+1\right)=7\times100=700\)