27/11+(5/8+2/27)×8
=11/27+5+16/27
=5+(11/27+16/27)
=5+1
=6
7800÷75+25-104
=104+25-104
=25;
(5.6-1.6÷2)×2.5
=(5.6-0.8)×2.5
=4.8×2.5
=12;
8/9-(1/6+1/4)÷9/4
=8/9-(1/6)×4/9-(1/4)×4/9
=8/9-2/18-1/9
=16/18-2/18-2/18
=12/18
=2/3;
如果本题有什么不明白可以追问,
27/11+(5/8+2/27)×8
=11/27+5+16/27
=5+(11/27+16/27)
=5+1
=6
7800÷75+25-104
=104+25-104
=25;
(5.6-1.6÷2)×2.5
=(5.6-0.8)×2.5
=4.8×2.5
=12;
8/9-(1/6+1/4)÷9/4
=8/9-(1/6)×4/9-(1/4)×4/9
=8/9-2/18-1/9
=16/18-2/18-2/18
=12/18
=2/3;
如果本题有什么不明白可以追问,