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\(\dfrac{5}{12}+\dfrac{-7}{12}=\dfrac{-2}{12}=\dfrac{-1}{6}\)
\(\dfrac{1}{2}+\dfrac{-2}{3}=\dfrac{3}{6}+\dfrac{-4}{6}=\dfrac{-1}{6}\)
\(\dfrac{3}{5}-\dfrac{4}{3}=\dfrac{9}{15}-\dfrac{20}{15}=\dfrac{-11}{15}\)
\(\dfrac{-15}{14}.\dfrac{21}{20}=\dfrac{-315}{280}=\dfrac{-9}{8}\)
\(\dfrac{-1}{6}\)
\(\dfrac{-1}{6}\)
\(\dfrac{-11}{15}\)
\(\dfrac{-9}{8}\)
-17.25=-425
2.
5(-8).2(-3)=10.24=240
3(-5)2+2(-5)-20=15.5+(-2)5-4.5=(15-2-4).5=9.5=45
34.(15-10)-15(34-10)=34.15-34.10-15.34+15.10=0+(-34+15).10=-19.10=-190
=\(\left[\dfrac{\left(0,4.2\right)^5}{\left(0,4\right)^6}+\dfrac{2^9.2^6.3^8}{\left(3.2\right)^6.2^9}\right]=\left[\dfrac{\left(0,4\right)^5.2^5}{\left(0,4\right)^6}+\dfrac{2^6.3^8}{3^6.2^6}\right]\)
=\(\left[\dfrac{2^5}{0,4}+3^2\right]\)
=\(\left[80+9\right]=89\)
\(\left[\dfrac{\left(2.0,4\right)^5}{0,4,0,4^5}+\dfrac{2^{15}.3^8}{3^6.2^6.2^9}\right]\div\dfrac{3^{20}.5^{30}}{3^{15}.5^{30}}\)
\(=\left[\dfrac{2^5.0.4^5}{0,4.0,4^5}+\dfrac{2^{15}.3^8}{3^6.2^{15}}\right]\div3^5\)
\(=\left[\dfrac{2^5}{0,4}+3^2\right]\div243\)
\(=80+\left(3^5\div3^2\right)\)
\(=80+3^3\)
\(=80+27\)
\(=107\)
a, (-15)+(32.5+80):52
(-15)+(9.5+80):25 = (-15)+(45+80):25 = (-15)+125:25=(-15)+5= -10
b,5.(12-3x)-20=10
5.(12-3x)=10+20 5.(12-3x)=30 12-3x=30:5 12-3x=6 3x=12-6 3x=6 x=6-3 x=3 Vậy x=3
a,15+ {[20/22-5]}
15+{[20/4+5]}
15+{[5+5]}
15+{10+0}
15+10=25
b,15+{[32-4]+2.2}
15+{[9-4]+2.2}
15+{5+2.2}
15+{5+4}
15+9=24
=24
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\(3.\left(-5\right)^2+2.\left(-15\right)-20=3.25-2.15-20=75-30-20=25\)