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a)10,6 : (-5,3) - (-6,87 x 100) = -2-(-687) = -2+687 = 685
b) 5 - (-7,4) - 1,6 - 2 i 3/8 + 7,8 :100 = 5+7,4-1,6-2,375+0,018 = 8,443
c)(-4)³ x (- 9 ) - (-2²) :(-2) = -64 x (-9)-(-4):(-2) = 576-2 = 574
d)3/5 x (-2 i 1/3) - 3 i 1/4 +2,75 - 0,6 = 3/5 x (7/3)-3,25+2,75 = 7/5-0,5 = 1,4-0,5 = 0,9
e)1,8 - 1,8 x (-2³ :4) = 1,8-1,8 x (-8:4) = 1,8-1,8 x (-2) = 1,8+3,6 = 5,4
2.
a)-3 x (2x - 1 ) - (1 - x ) = -6x+3-1+x = -5x+2
b) 2 x (7x + 5) -6 x (x - 2 ) = 14x+10-6x+12 = 2x+22
c) -2x * (8 - x ) + 5 x ( x² + 3x ) = -16x+2x²+5x²+15x = 7x²-x
d) 5 x (3 - 2x ) + 3 x ( -4x +6) = 15-10x-12x+18 = -22x+33