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\(\frac{3.8\left(-14\right)}{42.35}\)
\(=\frac{3.2.4.\left(-1\right).7.2}{2.3.7.5.7}\)
\(=-\frac{8}{35}\)
a: 27/-180=-27/180=-3/20=-21/140
-6/-35=6/35=24/120
-3/-28=3/28=15/140
b: \(\dfrac{3\cdot4+3\cdot7}{6\cdot5+9}=\dfrac{3\left(4+7\right)}{30+9}=\dfrac{11}{13}=\dfrac{2849}{13\cdot259}\)
\(\dfrac{6\cdot9-2\cdot17}{63\cdot6-119}=\dfrac{54-34}{259}=\dfrac{20}{259}=\dfrac{260}{259\cdot13}\)
Thanks
\(\frac{3.4+3.7}{6.5+9}=\frac{3\left(4+7\right)}{30+9}=\frac{3.11}{39}=\frac{33}{39}=\frac{11}{13}\)
\(\frac{3.4+3.7}{6.5+9}\)và \(\frac{6.9-2.17}{63.3-119}\)
\(\frac{3.4+3.7}{6.5+9}=\frac{3\left(4+7\right)}{30+9}=\frac{3.11}{39}=\frac{33}{39}=\frac{11}{13}\)
\(\frac{6.9-2.17}{63.3-119}=\frac{54-54}{63.3-11}=0\)
a) \(\frac{15.2-15.4}{15}=\frac{15.\left(2-4\right)}{15}=\frac{15.\left(-2\right)}{15}=\frac{-2}{1}=-2\)
b) \(\frac{3.7.\left(-14\right)}{42.35}=\frac{3.7.7.2.\left(-1\right)}{2.3.7.5.7}=\frac{-1}{5}\)
c) \(\frac{63.5-63.3}{2.\left(-3\right)^3-\left(-3\right)^2}=\frac{63.\left(5-3\right)}{2.\left(-3\right).\left(-3\right)^2-\left(-3\right)^2}=\frac{63.2}{\left(-6\right).\left(-3^2\right)-\left(-3\right)^2.1}=\frac{63.2}{\left(-6-1\right).\left(-3\right)^2}=\frac{63.2}{\left(-7\right).9}=\frac{63.2}{-63}=-2\)
dài dòng quá chả hiểu tí gj cả??????????????????????????????????????