4-6/7×5/6
=4×(6/7×5/6)
=4×5/7
=3又2/7
2/3×1/4×3
=2/3×3×1/4
=2×1/4
=1/2
1-7/9-2/9
=1-(7/9+2/9)
=1-1
=0
在电脑上不好约分,你自己写下来后就发现有好多可以约分了.
4-6/7×5/6
=4×(6/7×5/6)
=4×5/7
=3又2/7
2/3×1/4×3
=2/3×3×1/4
=2×1/4
=1/2
1-7/9-2/9
=1-(7/9+2/9)
=1-1
=0
在电脑上不好约分,你自己写下来后就发现有好多可以约分了.