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Bài làm
\(A=\frac{0,24\cdot450+0,8\cdot15\cdot5+3\cdot3\cdot8}{65-60+55-50+45-40+35-30+25-20+5}\)
\(A=\frac{0,24\cdot45\cdot10+0,8\cdot15\cdot5+3\cdot3\cdot8}{\left(65-60\right)+\left(55-50\right)+\left(45-40\right)+\left(35-30\right)+\left(25-20\right)+5}\)
\(A=\frac{2,4\cdot45+0,8\cdot75+72}{5+5+5+5+5+5}\)
\(A=\frac{2,4\cdot45+0,8\cdot\frac{5}{3}\cdot45+1,6\cdot45}{30}\)
\(A=\frac{45\left(2,4+\frac{4}{5}\cdot\frac{5}{3}+1,6\right)}{30}\)
\(A=\frac{45\cdot\left(\frac{20}{15}+\frac{36}{15}+\frac{24}{15}\right)}{30}\)
\(A=\frac{3\cdot\frac{80}{15}}{2}\)
\(A=\frac{\frac{80}{5}}{2}\)
\(A=\frac{80}{5}\cdot\frac{1}{2}\)
\(A=\frac{40}{5}\)
\(A=8\)
55 - 50 +45 - 40 + 35 -30 + 25 - 20 +15 - 10 +5
= 5 + 5 + 5 + 5 + 5 + 5
=5 x 6
=30
a)27*47+13*24+24*10*3
=27*47+13*24+24*30
=27*47+24*(13+30)
=27*47+24*43
=2301
b)
55-50+45-40+35-30+25-20+15-10+5
=(55-50)+(45-40)+(35-30)+(25-20)+(15-10)+5
=5+5+5+5+5+5
=30
\(
\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}\)
\(=\frac{48.700-24.2.10.45}{5+5+5+5+5}\)
\(=\frac{48.700-48.450}{5.5}\)
\(=\frac{48.\left(700-450\right)}{25}\)
\(=\frac{48.250}{25}\)
\(=480\)
