解答下列各题
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(1)【2/(2+5)+1/(1+3)】:【5/(2+5)+3/(1+3)】
=【2/7+1/4】:【5/7+3/4】
=15/28:41/28
=15:41
(2)3÷【8/(8+13)-2/(2+5)】×2/(2+5)+3
=3÷【8/21-2/7】×2/7+3
=3÷2/21×2/7+3
=31.5×2/7+3
=9+3
=12元
(3)1/6:1/7:1/8=28:24:21
甲3650×28/(28+24+21)
=3650×28/73
=1400个
乙3650×24/(28+24+21)
=3650×24/73
=1200个
丙3650×21/(28+24+21)
=3650×21/73
=1050个
=【2/7+1/4】:【5/7+3/4】
=15/28:41/28
=15:41
(2)3÷【8/(8+13)-2/(2+5)】×2/(2+5)+3
=3÷【8/21-2/7】×2/7+3
=3÷2/21×2/7+3
=31.5×2/7+3
=9+3
=12元
(3)1/6:1/7:1/8=28:24:21
甲3650×28/(28+24+21)
=3650×28/73
=1400个
乙3650×24/(28+24+21)
=3650×24/73
=1200个
丙3650×21/(28+24+21)
=3650×21/73
=1050个
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