这四道题怎么写,急啊
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(13)3/4-(3/8-1/12+1/6)
=3/4-(3/8-1/12+2/12)
=3/4-3/8-1/12
=6/8-3/8-1/12
=3/8-1/12
=9/24-2/24
=7/24
(14)3/4-[3/8-(1/12+1/6)]
=3/4-3/8-(1/12+2/12)
=6/8-3/8-1/4
=3/8-1/4
=3/8-2/8
=1/8
(15)3/4-3/8+1/4-1/8
=3/4+1/4-(3/8+1/8)
=1-1/2
=1/2
(16)3/8+4/15+5/8+2/15
=(3/8+5/8)+4/15+2/15
=1+6/15
=1+2/5
=7/5
=3/4-(3/8-1/12+2/12)
=3/4-3/8-1/12
=6/8-3/8-1/12
=3/8-1/12
=9/24-2/24
=7/24
(14)3/4-[3/8-(1/12+1/6)]
=3/4-3/8-(1/12+2/12)
=6/8-3/8-1/4
=3/8-1/4
=3/8-2/8
=1/8
(15)3/4-3/8+1/4-1/8
=3/4+1/4-(3/8+1/8)
=1-1/2
=1/2
(16)3/8+4/15+5/8+2/15
=(3/8+5/8)+4/15+2/15
=1+6/15
=1+2/5
=7/5
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直接化成同分母,再按照括号先后顺序算
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我知道
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