1樓:兗礦興隆礦
1、5÷(5/6+5/9)
=5/[5(1/6+1/9)
=1/(15/54)
=54/15
=3.6
2、1.8×1/7-0.4÷專7
=1/7(1.8-0.4)
=1.4/7
=0.2
3、1/3×(0.75+
屬0.25÷2/3)
=0.75/3*(1+1/2)
=0.75/2
=3/8
4、2×3×4×(1/2+1/3+1/4)=3*4+8+6
=265、2010×2/15+2010÷15×3=2010*1/5
=402
6、5/8÷1/12×4/5÷1/6
=5/8*12*4/5*6
=12*4*6/8
=187、5/4÷2/3-2/3×3/5
=5/4*3/2-2/3*3/5
=15/8-2/5
=59/40
8、3/5÷2/3-2/3×3/5
=9/10-6/15
=15/30
=1/2
9、5/8÷[5/6-(1/6+1/4)]=5/8*12/5
=1.5
2樓:匿名使用者
1、5÷(5/6+5/9)
= 5÷du5(1/6+1/9)
=1÷[(3+2)/18]
18/5
2、zhi1.8×dao1/7-0.4÷7= 9/5×1/7-2/5/7
= (9-2)/(5*7)
= 1/5
3、1/3×(0.75+0.25÷2/3)= 1/3×(3/4+1/4÷2/3)
= 1/3×(3/4+3/8)
= 1/4+1/8
= 3/8
4、2×3×4×(1/2+1/3+1/4)= 3×4 +2×4 + 2×3
= 12 + 8 + 6
= 26
5、2010×2/15+2010÷15×3= 2010×(2+3)/15
= 2010/3
= 670
6、5/8÷1/12×4/5÷1/6
= 5/8×12×4/5×6
= 36
7、5/4÷2/3-2/3×3/5
= 5/4×3/2-2/3×3/5
= 15/8-2/5
= (15×5-2×8)/40
= 59/40
8、3/5÷2/3-2/3×3/5
= 3/5×3/2-2/3×3/5
= 9/10 - 2/5
= (9-2×2)/10
= 1/2
9、5/8÷[5/6-(1/6+1/4)]= 5/8÷[5/6-(2+3)/12]
= 1/8÷(1/6-1/12)
= 1/8÷(1/12)
= 1/8*12
= 3/2
希望能幫助到你
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