Question

tinh nhanh:15 x 42 + 15 x 57 + 15

Answer 1

15 x 42 + 15 x 57 + 15

= 15 x ( 42 + 57 +1 )

= 15 x 100

= 1500

Answer 2

15 x 42 +15 x 57 + 15

=15(42 +57 +1)

=15 x 100 =1500

Answer 3

15 x 42 + 15 x 57 + 15

= 15 x ( 42 + 57 + 1 )

= 15 x 100

= 1500

Answer 4

=15x42+15x57+15x1

=15x(42+57+1)

=15x100

=1500

z nha bn

Answer 5

15 x 42 + 15 x 57 + 15 = 15 x ( 42 + 57 + 1 ) = 15 x 100 = 1500

Answer 6

630+855+15=1500

Answer 7

  15 x 42 + 15 x 57 + 15

= 15 x 42 + 15 x 57 + 15 x 1

= 15 x ( 42 + 57 + 1 )

= 15 x 100

= 1500

Answer 8

= 15 x (57 + 42 + 1)

= 15 x 100

= 1500

Answer 9

sai đề à em

Answer 10

15x42+15x57+15

=15x42+15x57+15x1

=15x(42+57+1)

=15x100

=1500

Answer 11

Ngô Mai à, bạn sai đó chứ em Giang đâu có sai.