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5 tháng 9 2016

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23 tháng 8 2016

a) 6,3 + (-3,7) + 2,4 + (-0,3)

= (6,3 + 2,4) + [-3,7 + (-0,3)]

= 8,7 + (-4)

=  4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5)

= (-4,9 + 4,9) + [5,5 + (-5,5)]

= 0 + 0

= 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2

= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7

= 0 + 0 + 3,7

= 3,7

d) (-6,5) . 2,8 + 2,8 . (-3,5)

= 2,8 . [-6,5 + (-3,5)]

= 2,8 . (-10)

= -28.

20 tháng 6 2017

a, \(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6-1,3=4,7\)

b, \(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(5,5-5,5\right)\)

\(=0+0=0\)

Chúc bạn học tốt!!!

20 tháng 6 2017

a, 6.3+(-3.7)+2.4+(-0.3) = (6,3 - 0,3) + (-3,7+2,4) = 6 - 1,3 = 4,7

b, (-4.9)+5.5+4.9+(-5.5) = (-4,9 +4,9) + (-5,5 + 5,5) = 0 + 0 = 0

17 tháng 2 2017

\(A=1,7+\left|3,4-x\right|\)

\(C\text{ó};\left|3,4-x\right|\)lớn hơn or =0

\(\Rightarrow\)\(1,7+\left|3,4-x\right|=1,7+0\)

\(\Rightarrow1,7+\left|3,4-x\right|=1,7\)

\(\Rightarrow\left|3,4-x\right|=0\)

\(\Rightarrow x=3,4\)

\(B=\left|x+2,8\right|-3,5\)

\(C\text{ó}:\left|x+2,8\right|\)Lớn hơn or = 0

\(\Rightarrow\left|x+2,8\right|-3,5=0-3,5\)

\(\Rightarrow\left|x+2,8\right|-3,5=-3,5\)

\(\Rightarrow\left|x+2,8\right|=0\)

\(\Rightarrow x=-2,8\)

\(C=\left|4,3-x\right|+3,7\)

\(C\text{ó}:\left|4,3-x\right|\) Lớn hơn or = 0

\(\Rightarrow\left|4,3-x\right|+3,7=0+3,7\)

\(\Rightarrow\left|4,3-x\right|+3,7=3,7\)

\(\Rightarrow\left|4,3-x\right|=0\)

\(\Rightarrow x=4,3\)

a) \(16^{^3}:8^2=\left(8.2\right)^3:8^2=8^3.2^3:8^2=\left(8^3:8^2\right).2^3=8.8=64\)

b)\(8^3.\left(0,125\right)^3=\left(8.0,125\right)^3=1^3=1\)

c)\(7^{^{200}}.\left(\frac{1}{7}\right)^{200}=\left(7.\frac{1}{7}\right)^{200}=1^{200}=1\)

d)\(4.\left(0,25\right)^3.64=4.\left(0,25\right)^3.4^3=4.\left(0,25.4\right)^3=4.1=4\)

e)....

cậu có thể tham khảo bài làm trên đây ạ, chúc cậu hok tốt ^^

30 tháng 9 2021

A=\(2^2-9^3+4^{-2}.16-2.5^2\)
\(=4-729+1-50=-774\)
B=\(\left(2^3.2\right).\dfrac{1}{2}+3^{-2}.3^2-7.1+5\)
\(B=2^4.\dfrac{1}{2}+1-7+5=8+1-7+5=7\)
 

16 tháng 8

 C = 2-3 + (52)3.5-3 + 4-3.16 - 2.32 - 105.(\(\dfrac{24}{51}\))0

C =  \(\dfrac{1}{8}\) + 56.5-3 + 4-3.42 - 2.9 - 105.1

C =  \(\dfrac{1}{8}\) + 53\(\dfrac{1}{4}\) - 18 - 105

C =  (\(\dfrac{1}{8}\) + \(\dfrac{1}{4}\))  - (105 - 125 + 18)

C = \(\dfrac{3}{8}\) - (-20 + 18)

C = \(\dfrac{3}{8}\)  + 2

C = \(\dfrac{19}{8}\)

26 tháng 8 2018

\(a.\frac{4^3.1^5}{9^2.8^2}=\frac{2^6.1}{3^4.2^6}=\frac{1}{81}\)

\(b.\frac{25^2.2^2.4^1}{3^3.2^3.224}=\frac{5^4.2^4}{3^3.2^8.7}=\frac{5^4}{3^3.2^4.7}=\frac{625}{3024}\)

\(c.\frac{25^3.5^6.5^2}{9^4.10^2}=\frac{5^{14}}{3^8.2^2.5^2}=\frac{5^{10}}{3^8.2^2}\)

18 tháng 9 2016

. là dấu nhân hay dấu phẩy vậy bạn

18 tháng 9 2016

dau phay ban nha con * la dau nhan