Question

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Answer 1

2)

$\frac{27}{40} : 18 + \frac{9}{16} = \frac{27}{40*18} + \frac{9}{16} = \frac{3}{80} + \frac{9}{16} = \frac{3}{80} + \frac{45}{80} = \frac{48}{80} = \frac{3}{5} = 0,6$

4)

$29 * (3,5 - 4,2) = 29 * (-0,7) = -20,3$

7)

$3x - |4x+15| = 3 (-8) - | 4 * (-8) + 15 | = -24 - 17 = -41$