18 x 7 + 18 x 6 - 18 x 14 + 18
giup minh nha
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18 x 7 + 18 x 16 – 18 x 14 + 18
= 18 x 7 + 18 x 16 – 18 x 14 + 18 x 1
= 18 x (7 + 16 – 14 + 1)
= 18 x 10
= 180
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\(\frac{6}{7}.y+\frac{7}{18}+\frac{1}{7}.y=\frac{7}{18}\)
\(\frac{6}{7}.y+\frac{1}{7}.y+\frac{7}{18}=\frac{7}{18}\)
\(\frac{6}{7}.y+\frac{1}{7}.y=\frac{7}{18}-\frac{7}{18}\)
\(y.\left(\frac{6}{7}+\frac{1}{7}\right)=0\)
\(y.1=0\)
\(y=0:1\)
\(y=0\)
a, \(\dfrac{7}{18}x-\dfrac{2}{3}=\dfrac{5}{18}\)
\(\dfrac{7}{18}x=\dfrac{5}{18}+\dfrac{2}{3}\)
\(\dfrac{7}{18}x=\dfrac{17}{18}\)
\(x=\dfrac{17}{18}\div\dfrac{7}{18}\)
\(x=\dfrac{17}{7}\)
a) \(\dfrac{7}{18}\).x-\(\dfrac{2}{3}\)=\(\dfrac{5}{18}\)
\(\dfrac{7}{18}\).x =\(\dfrac{5}{18}\)+\(\dfrac{2}{3}\)
\(\dfrac{7}{18}\).x = \(\dfrac{17}{18}\)
x = \(\dfrac{17}{18}\) :\(\dfrac{7}{18}\)
x =\(\dfrac{17}{7}\)
b)\(\dfrac{4}{9}\) - \(\dfrac{7}{8}\).x =\(\dfrac{-2}{3}\)
\(\dfrac{7}{8}\).x =\(\dfrac{4}{9}\)-\(\dfrac{-2}{3}\)
\(\dfrac{7}{8}\).x =\(\dfrac{10}{9}\)
x =\(\dfrac{10}{9}\) : \(\dfrac{7}{8}\)
x =\(\dfrac{80}{63}\)
c)\(\dfrac{1}{6}\)+\(\dfrac{-5}{7}\): \(\dfrac{-7}{18}\)
\(\dfrac{1}{6}\)+\(\dfrac{90}{49}\)
\(\dfrac{589}{294}\)
\(\frac{-7}{6}=\frac{x}{18}=\frac{-98}{y}=\frac{-14}{z}=\frac{t}{102}=\frac{u}{-18}\)
\(\text{+) }\frac{-7}{6}=\frac{x}{18}\)
\(\Rightarrow\left(-7\right).18=6.x\)
\(\Rightarrow-126=6.x\)
\(\Rightarrow x=-21\)
\(\text{+) }\frac{-7}{6}=\frac{-98}{y}\)
\(\Rightarrow\left(-7\right).y=6.\left(-98\right)\)
\(\Rightarrow y=\frac{6.\left(-98\right)}{-7}\)
\(\Rightarrow y=-84\)
\(\text{+) }\frac{-7}{6}=\frac{-14}{z}\)
\(\Rightarrow\left(-7\right).z=\left(-14\right).6\)
\(\Rightarrow\left(-7\right).z=-84\)
\(\Rightarrow z=12\)
\(\frac{-7}{6}=\frac{t}{102}\)
\(\Rightarrow\left(-7\right).102=t.6\)
\(\Rightarrow t=\frac{\left(-7\right).102}{6}=\frac{\left(-7\right).17.6}{6}\)
\(\Rightarrow t=-119\)
\(\frac{-7}{6}=\frac{u}{-18}\)
\(\Rightarrow\frac{-7}{6}=\frac{-u}{18}\)
\(\Rightarrow\left(-7\right).18=\left(-u\right).6\)
\(\Rightarrow-126=\left(-u\right).6\)
\(\Rightarrow-u=-21\)
\(\Rightarrow u=21\)
a: \(x-\dfrac{-18}{54}=\dfrac{7}{9}\cdot\left(-18\right)\)
=>x+1/3=7/9*(-18)=-7
=>x=-7-1/3=-22/3
b: -x-14/42=-4/7
=>x+1/3=4/7
=>x=4/7-1/3=12/21-7/21=5/21
18 x 7 + 18 x 6 - 18 x 14 + 18
= 18 x (7 + 6) - 18 x 4 + 18
= 18 x 13 - 18 x 4 + 18
= 18 x (13 - 4 + 1)
= 18 x 10
= 180
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tk mình nha