3 · {(300 - 80 ÷ 5) - [3 · 25 - (8 - 2 · 3)]} I have no idea what this is or how to solve it.
3 · {(300 - 80 ÷ 5) - [3 · 25 - (8 - 2 · 3)]}
=3×{(300−80÷5)−[3×25−(8−2×3)]}$Dothestuffinthebrackets,andusePEDMAS$$Multiplicationanddivisionisdonebeforeadditionandsubtraction$=3×{(300−16)−[3×25−(8−6)]}=3×{(284)−[3×25−(2)]}=3×{284−[3×25−2]}=3×{284−[75−2]}=3×{284−[73]}=3×{284−73}=3×{211}=3×211=633
3 · {(300 - 80 ÷ 5) - [3 · 25 - (8 - 2 · 3)]}
=3×{(300−80÷5)−[3×25−(8−2×3)]}$Dothestuffinthebrackets,andusePEDMAS$$Multiplicationanddivisionisdonebeforeadditionandsubtraction$=3×{(300−16)−[3×25−(8−6)]}=3×{(284)−[3×25−(2)]}=3×{284−[3×25−2]}=3×{284−[75−2]}=3×{284−[73]}=3×{284−73}=3×{211}=3×211=633