a, 15 × 15 ÷ 15
= 225 ÷ 15
= 15.
b, 16 × 17 ÷ 16 × 17
= 272 ÷ 272
= 1
15 x 15 : 15
= 225 : 15
= 15
16 x 17 : 17 x 16
= 272 : 17 x 16
= 16 x 16
= 256
a ) 15 x 15 : 15
= 225 : 15
= 15
b ) 16 x 17 : 17 x 16
= 272 : 17 x 16
= 16 x 16
= 256
a ) 15 x 15 : 15
= 225:15
= 15
b ) 16 x 7 : 17 x 16
= 272 :17 x 16
=16 x 16
=256
15 × 15 ÷ 15 16 × 17 : 17 × 16
= 15 × ( 15 ÷ 15 ) = 16 × 16 × ( 17 ÷ 17 )
= 15 × 1 = 256 × 1
= 15 = 256