用简便方法计算下列各题 1.3/4+1/2÷4/5+3/8 2.9/13÷7+1/7×5/13 3.3-3/2×10/2
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用简便方法计算下列各题 1.3/4+1/2÷4/5+3/8 2.9/13÷7+1/7×5/13 3.3-3/2×10/21-2/7
![用简便方法计算下列各题 1.3/4+1/2÷4/5+3/8 2.9/13÷7+1/7×5/13 3.3-3/2×10/2](/uploads/image/z/5945126-14-6.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%98+1.3%2F4%2B1%2F2%C3%B74%2F5%2B3%2F8+2.9%2F13%C3%B77%2B1%2F7%C3%975%2F13+3.3-3%2F2%C3%9710%2F2)
1.3/4+1/2÷4/5+3/8
=3/4+1/2*5/4+3/8
=3/4+5/8+3/8
=3/4+(5/8+3/8)
=3/4+1
=7/4
2.9/13÷7+1/7×5/13
=9/13*1/7+1/7×5/13
=1/7*(9/13+5/13)
=1/7*14/13
=2/13
3.3-3/2×10/21-2/7
=3-5/7-2/7
=3-(5/7+2/7)
=3-1
=2
=3/4+1/2*5/4+3/8
=3/4+5/8+3/8
=3/4+(5/8+3/8)
=3/4+1
=7/4
2.9/13÷7+1/7×5/13
=9/13*1/7+1/7×5/13
=1/7*(9/13+5/13)
=1/7*14/13
=2/13
3.3-3/2×10/21-2/7
=3-5/7-2/7
=3-(5/7+2/7)
=3-1
=2
用简便方法计算下列各题 1.3/4+1/2÷4/5+3/8 2.9/13÷7+1/7×5/13 3.3-3/2×10/2
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