第三题 要过程
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30×(1/5+1/3)
=30×1/5+30×1/3
=6+10
=16
2/3×5/7+2/3×2/7
=2/3×(5/7+2/7)
=2/3×1
=2/3
3/4×1/9+1/4÷9
=3/4×1/9+1/4×1/9
=(3/4+1/4)×1/9
=1×1/9
=1/9
5-(6/7÷3/14+3/16)
=5-(4+3/16)
=5-4又3/16
=13/16
=30×1/5+30×1/3
=6+10
=16
2/3×5/7+2/3×2/7
=2/3×(5/7+2/7)
=2/3×1
=2/3
3/4×1/9+1/4÷9
=3/4×1/9+1/4×1/9
=(3/4+1/4)×1/9
=1×1/9
=1/9
5-(6/7÷3/14+3/16)
=5-(4+3/16)
=5-4又3/16
=13/16
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