Explicación paso a paso:
4-(-5)+(-10)-(-12)(2)+20÷ -2
4+5-10-(-12×2) + 20/-2
9-10-(-12×2) +20/-2
-1-(-12×2)+20/-2}
-1-(-24)+20/-2
-1+24+20/-2
23+20/-2
23-10
=13
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Explicación paso a paso:
4-(-5)+(-10)-(-12)(2)+20÷ -2
4+5-10-(-12×2) + 20/-2
9-10-(-12×2) +20/-2
-1-(-12×2)+20/-2}
-1-(-24)+20/-2
-1+24+20/-2
23+20/-2
23-10
=13