simplify using using rational properties
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a)2/5*1/6-1/12+2/5×2/3
=2/30-1/12+4/15
=1/15-1/12+4/15
=1/15+4/15-1/2
=5/15-1/12
=1/3-1/12
=4-1/12
=3/12
=1/4
b)1/7×2/9-3/14×1/9+2/9×1/14
=2/63-3/156+2/156
=2/63-3+2/156
=2/63-1/156
=0.025
=2/30-1/12+4/15
=1/15-1/12+4/15
=1/15+4/15-1/2
=5/15-1/12
=1/3-1/12
=4-1/12
=3/12
=1/4
b)1/7×2/9-3/14×1/9+2/9×1/14
=2/63-3/156+2/156
=2/63-3+2/156
=2/63-1/156
=0.025
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