知识大全 1、7.625-19/3+5.75-11/8=? 2、×4.6×9+4×9.2×18/1×2.3×4.5+3×6.9×13.5=

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1、7.625-19/3+5.75-11/8=? 2、×4.6×9+4×9.2×18/1×2.3×4.5+3×6.9×13.5=?

1、7.625-19/3+5.75-11/8
=(7又3/8-11/8)+5.75-19/3
=6+5又3/4-6又1/3
=5又3/4-1/3
=5又5/12
2、2×4.6×9+4×9.2×18/(1×2.3×4.5+3×6.9×13.5)
=1×2.3×4.5×(4+8)/[1×2.3×4.5×(1+3)]
=12/4
=3

1乘2.3乘4.5加3乘6.9乘13.5分之2乘4.6乘9加4乘9.2乘18是多少?

(1×2.3×4.5+3×6.9×13.5)分之(2×4.6×9+4×9.2×18)
=1×2.3×4.5×(1+3×3×3)分之【1×2.3×4.5×(2×2×2+4×4×4)】
=(1+3×3×3)分之(2×2×2+4×4×4)
=28分之72
=7分之18

(1)6/17÷1/9*17/6(2)1/53÷3/11÷11/3(3)20*18/19-18/19(4)17÷6/5+19÷6/5

你好:

(1)
6/17÷1/9*17/6
=6/17×17/6×9
=9

(2)
1/53÷3/11÷11/3
=1/53(×11/3×3/11)
=1/53

(3)
20*18/19-18/19
=(20-1)×18/19
=19×18/19
=18

(4)
17÷6/5+19÷6/5
=17×5/6+19×5/6
=(17+19)×5/6
=36×5/6
=30

7.625减6又1/3加5.75减1又3/8

7.625-6又1/3+5.75-1又3/8
=(7.625-1.375)+5.75-6又1/3
=6.25+5.75-6又1/3
=12-6又1/3
=5又2/3

(1/2+1/3+1/4+```+1/20)+(2/3+2/4+```+2/20)+(3/4+3/5+···3/20)+···+(18/19+18/20)+19/20=?

(1/2+1/3+1/4+...+1/20)+(2/3+2/4+...+2/20)+(3/4+3/5+...+3/20)+...+(18/19+18/20)+19/20
[1+2+3+...+(n-1)]/n=n(n-1)/2n=(n-1)/2
(1/2+1/3+1/4+...+1/20)+(2/3+2/4+2/5+...+2/20)+(3/4+3/5+...+3/20)+...+(18/19+18/20)+19/20
=1/2+(1/3+2/3)+(1/4+2/4+3/4)+...+(1/20+2/20+3/20+...+19/20)
=(2-1)/2+(3-1)/2+(4-1)/2+...+(20-1)/2
=(1+2+3+...+20)/2
=20*21/4
=5*21
=105

(11/19*0.317*18/19-0.317)除以3.17-(0.875-3/4+1/8-0.25)

(11\\19*0.317+0.317*18\\19-0.317)\\3.17-(0.875-3\\4+1\\8-0.25)
=0.317[11\\19+18\\19-1]/3.17-[7/8-6/8+1\\8-2/8]
=10/19-0
=10/19

4.5÷[(1/2-3÷7.5)×18/5]=?

4.5÷[(1/2-3÷7.5)×18/5]
=4.5÷[(1/2-2/5)×18/5]
=4.5÷(1/10×18/5)
=4.5÷9/25
=9/2×25/9
=25/2

(1)(-5)×6×(-10)×(-8)(2)19又18/17×(-36)(3)(3/2-6/5-8/5)×(-24)(4)-3-(+7)

(1) =-30×80=-2400 (2)=19×17×-2=-646 (3)=-24/19×(-24)=19 (4)=-3-7=-10

(5)=-52-19-37+24=-84 (6)=-3/4

5/2÷3/5= 18/7÷4= 8÷3/2×3/1=

25/6
9/14
16

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