Question

(-4+12):(-1-3)-{-3-[(-5)-(-8-4):(5-3)].(-3+5)}:(-9+8)=

Answer 1

$\left(-4+12\right)\div \left(-1-3\right)+3-\left[\left(-5\right)-\left(-8-4\right)\div \left(5-3\right)\right]\left(-3+5\right)\div \left(-9+8\right)$

$=8\div \left(-1-3\right)+3-\left[\left(-5\right)-\left(-8-4\right)\div \left(5-3\right)\right]\left(-3+5\right)\div \left(-9+8\right)$

$=8\div \left(-4\right)+3-\left[\left(-5\right)-\left(-8-4\right)\div \left(5-3\right)\right]\left(-3+5\right)\div \left(-9+8\right)\\\\=8\div \left(-4\right)+3-1\cdot \left(-3+5\right)\div \left(-9+8\right)\\\\=8\div \left(-4\right)+3-1\cdot \:2\div \left(-9+8\right)\\\\=8\div \left(-4\right)+3-1\cdot \:2\div \left(-1\right)\\\\=-2+3-1\cdot \:2\div \left(-1\right)\\\\=-2+3-\left(-2\right)\\\\-2+3-\left(-2\right)\\\\=1-\left(-2\right)\\\\=1+2\\\\=3$