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25 tháng 7 2017
1.
a) \(\frac{-7}{9}.2\frac{3}{4}=\frac{-7}{9}.\frac{11}{4}=\frac{-77}{36}\)
b) \(\frac{2}{3}+\frac{1}{3}.\frac{-2}{5}=\frac{2}{3}+\frac{-2}{15}=\frac{8}{15}\)
c) \(\frac{3}{4}.15\frac{1}{3}-\frac{3}{4}.43\frac{1}{3}=\frac{3}{4}.\frac{46}{3}-\frac{3}{4}.\frac{130}{3}=\frac{23}{2}-\frac{65}{2}=-21\)
d) \(\left(-49,1\right).\frac{13}{27}-58,9.\frac{13}{27}=\frac{13}{27}.\left(-49,1-58,9\right)=\frac{13}{27}.\left(-108\right)=-52\)
e) \(0,375:\left(-4,5\right)=\frac{-1}{12}\)
f) \(3\frac{1}{7}:\left(-1\frac{3}{7}\right)=\frac{22}{7}:\frac{-10}{7}=\frac{-11}{5}\)
g) \(9\frac{1}{3}:4\frac{2}{3}-2=\frac{28}{3}:\frac{14}{3}-2=2-2=0\)
h) \(\left(7\frac{3}{4}:0,3125+4,5.2\frac{2}{45}\right):\left(-8,5\right)=\left(\frac{31}{4}:\frac{5}{16}+\frac{9}{2}.\frac{92}{45}\right):\frac{-17}{2}=\left(\frac{124}{5}+\frac{46}{5}\right):\frac{-17}{2}=34:\frac{-17}{2}=-4\)
25 tháng 7 2017
Bài 1 : Tính:
a)
\(\frac{-7}{9}.2\frac{3}{4}=\frac{-7}{9}.\frac{11}{4}=\frac{-77}{36}\)
b)
\(\frac{2}{3}+\frac{1}{3}.\frac{-2}{5}=\frac{2}{3}+\frac{-2}{15}=\frac{10}{15}+\frac{-2}{15}=\frac{8}{15}\)
c)
\(\frac{3}{4}.15\frac{1}{3}-\frac{3}{4}.43\frac{1}{3}=\frac{3}{4}.\frac{46}{3}-\frac{3}{4}.\frac{130}{3}\)\(=\frac{23}{2}-\frac{65}{2}=\frac{-42}{2}=-21\)
....
Tự lm tiếp dạng như v
Bài 2 :
\(A=\frac{-6}{11}.\frac{7}{10}.\frac{11}{-6}.-20=\left(\frac{-6}{11}.\frac{11}{-6}\right).\left(\frac{7}{10}.-20\right)\)\(=1.\left(-14\right)=-14\)
.....
Bài 3 :
\(\frac{3}{7}.x-\frac{2}{5}.x=\frac{-17}{35}\)
\(\Leftrightarrow\frac{3}{7}-\frac{2}{5}.x=\frac{-17}{35}\)
\(\Leftrightarrow\frac{1}{35}x=\frac{-17}{35}\)
\(\Leftrightarrow x=\frac{-17}{35}:\frac{1}{35}\)
\(\Leftrightarrow x=\frac{-17}{35}.35=-17\)
10 tháng 11 2016
a, \(\frac{8^{15^{ }}.3^{16}}{4^{23^{ }}.9^8}=\frac{2^{45}.3^{16}}{2^{46}.3^{16}}=\frac{2^{45}}{2^{46}}=\frac{1}{2}\)
b, \(\sqrt{121}-4.\sqrt{9}+\sqrt{36}=11-4.3+6=11-12+6=5\)
c,
\(\frac{2^5}{5^2}+5\frac{1}{2}.\left(4,5-2,5\right)+\frac{2^3}{-4}+\left(-2016\right)^0\)
\(\frac{4}{25}+\frac{11}{2}.2+\frac{8}{-4}+1=\frac{4}{25}+11+\left(-2\right)+1=\frac{4}{25}+10\)
= \(\frac{254}{25}\)
DT
2
DP
16 tháng 8 2017
\(\frac{4,5\div\left[47,735-\left(26\frac{1}{3}-18.0,75\right).2,4\div0,88\right]}{17,81\div1,37-23\frac{2}{3}\div1\frac{5}{6}}\)
\(=\frac{4,5\div\left[47,735-\left(\frac{79}{3}-\frac{27}{2}\right)\cdot\frac{30}{11}\right]}{13-\frac{142}{11}}\)
\(=\frac{4,5\div\left[47,735-\frac{77}{6}\cdot\frac{30}{11}\right]}{\frac{1}{11}}=\frac{4,5\div\left[47,735-35\right]}{\frac{1}{11}}\)
\(=\frac{4,5\div12,735}{\frac{1}{11}}=\frac{100}{283}\div\frac{1}{11}=\frac{1100}{283}\)
10 tháng 2 2017
Đặt A:
A = \(\frac{4,5:47,375-\left(26\frac{1}{3}-18.0,75\right).2,4:0,88}{17,81:1,37-23\frac{2}{3}:1\frac{5}{6}}\)
= \(\frac{\frac{9}{2}:\left[\frac{379}{8}-\left(\frac{79}{3}-\frac{27}{2}\right).\frac{30}{11}\right]}{13-\frac{71}{3}.\frac{6}{11}}\)
= \(\frac{\frac{9}{2}:\left[\frac{379}{8}-\frac{77}{6}.\frac{30}{11}\right]}{13-\frac{142}{11}}\)
= \(\frac{\frac{9}{2}:\left[\frac{379}{8}-35\right]}{\frac{1}{11}}\)
= \(\left(\frac{9}{2}:\frac{99}{8}\right).1\)
= \(\frac{4}{11}.11\) = 4
=> A = 4
27 tháng 10 2016
a)45*32+210*30=210*9+210*30=210*(9+30)=210*39
b) 37-x/3=x-13/7
37+13/7=x+x/3
272/7=4x/3
x=272/7:4/3
x=204/7
(2/5)^2+5 1/3*(4,5-2)+23/-4
=4/25+16/3*2,5+(-23/4)
=4/25+40/3+(-23/4)
=203/15+(-23/4)
=467/60