1、(1)3/4;15/28
(2)9;11;3/40;3/2
(3)2/9;45;一;2/9;9/2;9
2、(1)43/44
(2)11/18
(3)23/24
(4)3/2;一样
3、(1)32×(1/4-1/8)
=32×1/4-32×1/8
=8-4
=4
(2)63×5/62=(62+1)×5/62
=62×5/62+1×5/62
=5+5/62
=315/62
(3)6/13×1/7+8/13×1/7
=(6/13+8/13)×1/7
=14/13×1/7
=2/13
4、(1)错;3/5×5-2
=3-2
=1
(2)错;2/9+5/9×9/10
=4/18+9/18
=13/18
5、1-3/10×3=1/10(m)
6、4/5×3/10×75=18(元)
7、(1)3/2-5/8×2/3=2/3×(1-5/8)
=3/2×3/8
=1/4
(2)4/13×2/7+4/7×11/13
=4/7×2/13+4/7×11/13
=4/7×(2/13+11/13)
=4/7