\(=\dfrac{6}{5}\cdot\dfrac{-4}{3}=\dfrac{-24}{15}=-\dfrac{8}{5}\)
1,2 . ( \(\dfrac{1}{3}-\dfrac{5}{3}\))
= 1,2 . \(\dfrac{-4}{3}\)
= \(\dfrac{6}{5}\). \(\dfrac{-4}{3}\)
= \(\dfrac{-8}{5}\)
1. a) \(\dfrac{5}{3}+\dfrac{-2}{7}-\left(-1,2\right)\)
b) \(0,25+\dfrac{3}{5}-\left(\dfrac{1}{8}-\dfrac{2}{5}+1\dfrac{1}{4}\right)\)
Giúp mình với 
Tìm x
(1,2)^3.x^2=(1,2)^5
a.Tính A = 1,2 + 2 ,3 + 3 ,4 + ... + n ( n +1 )
b.Tính B = 1 + 2 + 3 + ... + 98 + 99
c.Tính C = 1 + 3 +5 + ... + 997 + 999
\(B=\frac{2,5-4\left(\frac{5}{2}-1,2\right)+\frac{3}{8}}{4\left(\frac{5}{2}-1,2\right)-\frac{3}{5}:\frac{2}{5}}-\frac{55}{148}\)
(\(\sqrt{\dfrac{1}{4}}\) - 1,2) : 1\(\dfrac{1}{20}\) - (- \(\dfrac{5}{2}\))2 + \(\left|1,25-\dfrac{3}{4}\right|\)
Tính \(A=-\frac{19}{2^3.3^2.5}+\left(-3\frac{1}{2}\right)^2:1,2-\left(-1\frac{1}{3}\right)^3:\frac{5}{6}\)
Giải bài toán sau 1 + 1/2 + 1/2 mũ 2 + 1,2 mũ 3 + 1,2 mũ 4 + 3 chấm ba chấm + 1,2 mũ 99 + 1/2 mũ 100
Thực hiện phép tính hợp lý (nếu có thể) :
a) (\(31\dfrac{6}{13}\) + \(5\dfrac{9}{41}\) ) - \(36\dfrac{6}{13}\)
b) \(\dfrac{5}{3}\) +( \(\dfrac{-2}{7}\) ) - (-1,2)
c) 0,25 + \(\dfrac{3}{5}\) - (\(\dfrac{1}{8}\) - \(\dfrac{2}{5}\) + \(1\dfrac{1}{4}\) )
Tính
\(A=\frac{2,5-4\left(\frac{5}{2}-1,2\right)+\frac{3}{8}}{4\times\left(\frac{5}{2}-1,2\right)-\frac{3}{5}:\frac{2}{5}}-\frac{55}{148}\)
|x-3|>1/2
|1,2+x|<1,22
|x+3/5|-1/2=1/2
0,2+|x-2,3|=1,1
|x-4/5|=3/4
|x+1|=2
6-|1/2-x|=2/5
-1+|x+4,5|=-6,2
