来自董敏娥的问题
(3/7+3/8+5/9+7/10)/(3/8+7/10+3/7)=的过程与解答
(3/7+3/8+5/9+7/10)/(3/8+7/10+3/7)=的过程与解答
1回答
2020-02-2523:47
(3/7+3/8+5/9+7/10)/(3/8+7/10+3/7)=的过程与解答
(3/7+3/8+5/9+7/10)/(3/8+7/10+3/7)=的过程与解答
(3/7+3/8+5/9+7/10)/(3/8+7/10+3/7)
=1+(5/9)/(3/8+7/10+3/7)
=1+(5/9)/[3*(7+8)/(7*8)+7/10]
=1+(5/9)/[45/56+7/10]
=1+(5/9)/(321/280)
=1+1400/2889