Question

Bài 1 tính bằng cách thuận tiện nhất: 3/2x5/7+3/2x2/7+1/4

 

Answer 1

Trả lời

3/2.5/7+3/2.2/7+1/4

=3/2.(5/7+2/7)+1/4

=3/2.1+1/4

=3/2+1/4

=6/4+1/4

=7/4

Answer 2

3/2x5/7+3/2x2/7+1/4

= 3/2 x ( 5/7 + 2/7 ) + 1/4

= 3/2 x 1 + 1/4

= 3/2 + 1/4 

= 6/4 + 1/4

= 7/4

Answer 3

\(\frac{3}{2}.\left(\frac{5}{7}+\frac{2}{7}\right)+\frac{1}{4}=\frac{3}{2}.1+\frac{1}{4}=\frac{3}{2}+\frac{1}{4}=\frac{7}{4}=1,75\)