(3分之2一7分之4)Ⅹ2+5分之4?

2024-12-01 19:16:44
推荐回答(1个)
回答1:

(2/3-4/7)x2+4/5

=(14/21-12/21)x2+4/5

=2/21x2+4/5

=4/21+4/5

=20/105+84/105

=104/105