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22 tháng 2 2017

4.75x(3.9+2.7+3.4)=4.75x10=47.5

10.05x(15.7-4.7-1)=10.05x10=100.5

k mk nha

22 tháng 2 2017

Cảm ơn

5 tháng 2 2017

a) A = 13,8 : (5,6 - 4,91) = 13,8 - 0,69

A = 13,11

b) 4 = 13.8 : (5,6 - x)

5,6 - x = 13,8 : 4 

5,6 - x = 3,45

x = 5,6 -3,45

x = 2,15

14 tháng 5 2017

a) A = 13,8 : ( 5,6 - 4,91 )

    A = 13,8 : 0,69

    A = 20

b) 4 = 13,8 : ( 5,6 - x )

    5,6 - x = 13,8 : 4 

    5,6 - x = 3,45

               x = 5,6 - 3,45

               x = 2,15

22 tháng 5 2019

a, Với x = 1015 , ta có : 

\(A=\frac{2002-1998:(1015-16)}{316+6,84:0,01}\)

\(A=\frac{2002-1998:999}{316+\frac{684}{100}:\frac{1}{100}}\)

\(A=\frac{2002-2}{316+\frac{171}{25}\cdot100}\)

\(A=\frac{2000}{316+\frac{171}{1}\cdot4}\)

\(A=\frac{2000}{316+684}=\frac{2000}{1000}=2\)

b, Tự làm

9 tháng 4 2017

a, giá trị biểu thức = \(\frac{1989+90}{9}\)\(=\)2079:9=231

b,giá trị a để B có kết quả lớn nhất là 7.B=\(\frac{1989+720}{9}\)\(= \) 2709:9=301

9 tháng 4 2017

301 bạn nhé

23 tháng 1 2022

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4 tháng 8 2018

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