126:6=
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126 - 126 . (x - 6) = 99
126 . [ 1 - ( x - 6)] = 99
126 . [ 1 - x + 6 ] = 99
126 . [ 7 - x ] = 99
7 - x = 11/14
x = 7 - 11/14 = 87/14
126 - 126 . (x - 6) = 99
126 . (x - 6)=27
x - 6 =3/14
x=3/14 + 6
x=87/14
\(\dfrac{90}{126}=\dfrac{5}{7}\)
\(\Rightarrow\dfrac{90}{126}< \dfrac{6}{7}\) (Vì \(\dfrac{5}{7}< \dfrac{6}{7}\))
\(\dfrac{35}{49}=\dfrac{5}{7}\)
\(\Rightarrow\dfrac{90}{126}=\dfrac{35}{49}\) (Vì \(\dfrac{5}{7}=\dfrac{5}{7}\))
\(\dfrac{4^9\cdot36+64^4}{100\cdot16^4}=\dfrac{2^{20}\cdot3^2+2^{24}}{2^{18}\cdot5^2}=\dfrac{2^{20}\left(3^2+2^4\right)}{2^{18}\cdot5^2}=4\)
a)\(\left(-4\right).125.\left(-25\right).\left(-6\right).\left(-8\right)\)
\(=\left[\left(-4\right)\cdot\left(-25\right)\right]\cdot\left[125\cdot\left(-8\right)\right]\cdot\left(-6\right)\)
\(=100\cdot\left(-1000\right)\cdot\left(-6\right)\)
\(=600000\)
b) \(\left(-98\right)\cdot\left(1-126\right)-126\cdot98\)
\(=\left(-98\right)\cdot1-\left(-98\right)\cdot126-126\cdot98\)
\(=\left(-98\right)+98\cdot126-126\cdot98\)
\(=\left(-98\right)\)
\(=63-\dfrac{11}{6}-\dfrac{13}{11}=\dfrac{3959}{66}\)
126 : 6 = 21
126 : 6 = 21