Question

8) Calcula a) 20 +{[10+(-3)]-45}-(32-4) b) -26 + (-12+15)- (20-35)​

Answer 1

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A .-

$20+\left\{\left[10+\left(-3\right)\right]-45\right\}-\left(32-4\right)$

$=20-38-\left(32-4\right)$

$=-18-\left(32-4\right)$

$=-18-(28)$

$=-18-28$

$=-46$

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B.-

$-26+\left(-12+15\right)-\left(20-35\right)$

$=-26+3-\left(20-35\right)$

$=-26+3-\left(-15\right)$

$=-23-\left(-15\right)$

$=-23+15$

$=-8$

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