十二分之一等于几分之一加几分之一加几分之一 加几分之一

2024-11-22 13:43:58
推荐回答(2个)
回答(1):

1/12
=1/24+1/24
=1/24+1/48+1/48
=1/24+1/48+3/144
=1/24+1/48+2/144+1/144
=1/24+1/48+1/72+1/144

回答(2):

(x-2)²-2(x+3)(x-2),
=(x²-4x+4)-2(x²+x-6)
=x²-4x+4-2x²-2x+12
=-x²-6x+16
=-9-18+16
=-11
(1)4x²-64
=4(x²-16)
=4(x+4)(x-4)

(2)4ab²-4a²b-b³
=-b(4a²-4ab+b²)
=-b(2a-b)²