Question

tính bằng cách thuận tiện nhất: 7/4x15/7+13/7x9/4-7/4x2/7 đg gấp nha :PPPPPPPPPP

Answer 1

7/4 x 15/7 + 13/7 x 9/4 -7/4 x 2/7

=7/4 x ( 15/7- 2/7) + 13/7 x 9/4

=7/4 x 13/7 + 13/7 x 9/4

=13/7 x (7/4 x 9/4)

=13/7 x 16/4

=13/7 x 4

=52/7

Answer 2

7/4 x 15/7 + 13/7 x 9/4 -7/4 x 2/7

=7/4 x ( 15/7- 2/7) + 13/7 x 9/4

=7/4 x 13/7 + 13/7 x 9/4

=13/7 x (7/4 + 9/4)

=13/7 x 16/4

=13/7 x 4

=52/7