34/15-(4/15+2/5) 2-3/8÷7/16-1/7 5/12÷8+1/8×7/12 2/3×8/5+1/3÷5/8 (1/4-1/20)×40
3/4×【(7/15-1/5)÷2/3】3/5×(1/7+8/21÷2/3)(2/3-3/4×1/3)÷5/41/2-8/9÷5/6×3/16(5/12+1/9-3/8)...
3/4×【(7/15-1/5)÷2/3】 3/5×(1/7+8/21÷2/3) (2/3-3/4×1/3)÷5/4 1/2-8/9÷5/6×3/16 (5/12+1/9-3/8)×72 【1-(75%+1/12)】×3/2 (简便计算)
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第一个题要是能写清楚点就好了 感觉有点乱 不过按顺序一一算能算出来
3/4×【(7/15-1/5)÷2/3】=3/4×3/2×(7/15-1/5)
=3/4×3/2×(7/15-3/15)
=3/4×3/2×4/15
= 3/10
3/5×(1/7+8/21÷2/3)=3/5×(1/7+4/7)
=3/5×5/7=3/7
(2/3-3/4×1/3)÷5/4=(2/3-1/4)×4/5
=2/3×4/5-1/4×4/5
=8/15-3/15
=5/15
=1/3
1/2-8/9÷5/6×3/16 =1/2-1/5
=3/10
(5/12+1/9-3/8)×72 = 5/12×72 +1/9×72 -3/8 ×72
=30 +8-27
=5
【1-(75%+1/12)】×3/2=【1-(3/4+1/12)】×3/2
=【1-5/6】×3/2
=1/6×3/2
=1/4
3/4×【(7/15-1/5)÷2/3】=3/4×3/2×(7/15-1/5)
=3/4×3/2×(7/15-3/15)
=3/4×3/2×4/15
= 3/10
3/5×(1/7+8/21÷2/3)=3/5×(1/7+4/7)
=3/5×5/7=3/7
(2/3-3/4×1/3)÷5/4=(2/3-1/4)×4/5
=2/3×4/5-1/4×4/5
=8/15-3/15
=5/15
=1/3
1/2-8/9÷5/6×3/16 =1/2-1/5
=3/10
(5/12+1/9-3/8)×72 = 5/12×72 +1/9×72 -3/8 ×72
=30 +8-27
=5
【1-(75%+1/12)】×3/2=【1-(3/4+1/12)】×3/2
=【1-5/6】×3/2
=1/6×3/2
=1/4
追问
34/35-(4/15+2/5) 2-3/8÷7/16-1/7 (5/12+1/9-3/8)×72(这几条怎么写?)
追答
34/35-(4/15+2/5)=34/35-(4/15+2/5)
= 34/35-(4/15+6/15)
=34/35-10/15
=510/525-350/525
=160/525
=32/105
2-3/8÷7/16-1/7 =2-3/8×16/7-1/7
=2-6/7-1/7
=2-1
=1
(5/12+1/9-3/8)×72 = 5/12×72 +1/9×72 -3/8 ×72
=30 +8-27
=5
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()*3/2=4/3,5/2÷()=5/4
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3/4×【(7/15-1/5)÷2/3】
=3/4×【(7/15-3/15)÷2/3】
=3/4×【4/15÷2/3】
=3/4×【4/15×3/2】
=3/4×6/5
=9/10
=3/4×【(7/15-3/15)÷2/3】
=3/4×【4/15÷2/3】
=3/4×【4/15×3/2】
=3/4×6/5
=9/10
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34/15-(4/15+2/5)=34/15-(4+6)/15=24/15=6/5
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