分数计算
(25/4+25/7)÷(5/4+5/7)
=【25x(1/4+1/7)】÷【5x(1/4+1/7)】
=25÷5
=5
(25/4+25/7)/(5/4+5/7)
=(25x7/28+25x4/28)/(5x7/28+5x4/28)
=[25x(7+4)/28]/[5(7+4)/28]
=(25x11)/28/(5x11)/28
=[(25x11)/28]x[28/(5x11)]
=5
(25/4+25/7)÷(5/4+5/7)
=(25×7+25×4)/(4×7)÷【(5×7+5×4)】/(4×7)
=(25×7+25×4)÷(5×7+5×4)
=【25×(7+4)】÷【5×(7+4)】
=25÷5
=5