20152015.2016 - 20162016.2015 = ?
giải thích từng bước ra hộ e vs a
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.201520152015.2016 + 20162016.2015
B(40)={0;40;80;120;160;200;240;280;320;360;...}
B(45)={0;45;90;135;180;225;270;315;360;..}
=> BCNN(40,45)=360
Ta có: 40=2³.5
45=5.3²
=>BCNN(40;45)Là 2³.9.5=180
Vậy BCNN(40;45)=180
\(a,\dfrac{-3}{5}+\dfrac{7}{21}+\dfrac{-4}{5}+\dfrac{7}{5}\)
\(=\left(\dfrac{-3}{5}+\dfrac{7}{5}\right)+\dfrac{7}{21}+-\dfrac{4}{5}\)
\(=\dfrac{4}{5}+\dfrac{7}{21}+-\dfrac{4}{5}\)
\(=\left(\dfrac{4}{5}+\dfrac{-4}{5}\right)+\dfrac{7}{21}\)
\(=0+\dfrac{7}{21}=\dfrac{7}{21}\)
\(b,\dfrac{-3}{17}+\left(\dfrac{2}{3}+\dfrac{3}{17}\right)\)
\(=-\dfrac{3}{17}+\dfrac{2}{3}+\dfrac{3}{17}\)
\(=\left(\dfrac{-3}{17}+\dfrac{3}{17}\right)+\dfrac{2}{3}\)
\(=0+\dfrac{2}{3}=\dfrac{2}{3}\)
\(c,\dfrac{-5}{21}+\left(\dfrac{-16}{21}+1\right)\)
\(=\dfrac{-5}{21}+\dfrac{-16}{21}+1\)
\(=\dfrac{-21}{21}+1\)
\(=\left(-1\right)+1=0\)
Tick mình nha ^^
a.\(\dfrac{-3}{5}\)+\(\dfrac{7}{21}\)+\(\dfrac{-4}{5}\)+\(\dfrac{7}{5}\)= (\(\dfrac{-3}{5}\)+\(\dfrac{-4}{5}\)+\(\dfrac{7}{5}\)) + \(\dfrac{7}{21}\)=0+\(\dfrac{7}{21}\)=\(\dfrac{7}{21}\)
b.\(\dfrac{-3}{17}\)+(\(\dfrac{2}{3}\)+\(\dfrac{3}{17}\))= \(\dfrac{-3}{17}\)+\(\dfrac{3}{17}\)+\(\dfrac{2}{3}\)=0+\(\dfrac{2}{3}\)=\(\dfrac{2}{3}\)
c.\(\dfrac{-5}{21}\)+(\(\dfrac{-16}{21}\)+1)=\(\dfrac{-5}{21}\)+\(\dfrac{-16}{21}\)+1=(-1)+ 1 = 0
\(\frac{x-4}{-5}=\frac{1-2x}{3}\)
Nhân cả 2 vế với 15 ,ta được:
\(\frac{15.\left(x-4\right)}{-5}=\frac{15.\left(1-2x\right)}{3}\)
\(\Leftrightarrow\left(-3\right).\left(x-4\right)=5.\left(1-2x\right)\)
\(\Leftrightarrow-3x+12=5-10x\)
\(\Leftrightarrow-3x+10x=5-12\)
\(\Leftrightarrow7x=-7\)
\(\Leftrightarrow x=-1\)
Vậy x=-1
(𝑥−4)/−5=(1−2𝑥)/3
−15⋅𝑥−4−5=−15⋅−2𝑥+13
−15⋅𝑥−4−5=−15⋅−2𝑥+13
3(𝑥−4)=−5(−2𝑥+1)
3(x-4)=-5(-2x+1)
3(𝑥−4)=−5(−2𝑥+1)
3𝑥−12=−5(−2𝑥+1)
3𝑥−12=−5(−2𝑥+1)
3𝑥−12=10𝑥−5
𝑥 = -1
\(20152015.2016-20162016.2015\)
\(\text{=}10001.2015.2016-10001.2016.2015\)
\(\text{=}10001.\left(2015.2016-2016.2015\right)\)
\(\text{=}10001.0\)
\(\text{=}0\)