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1.-((-2+5+(-7))x(8-6-1)
signos multiplicados y diferentes nos da = "-"
-2 + 5 -7 x 1 = -2 -2 x1 = -4
2-(-15÷5)+(-15)
-3 -15 = -18
3.-(-45÷9)x(49÷7)
-5 x 7 = -35
( -2 +5 -7 ) x (8 -7 )
( - 9 +5 ) x 1
- 4 x 1
-4 ►Respuesta
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2 ►( -15 ÷ 5) + (-15)
- 3 -15
- 18 ►Respuesta
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3 ►( -45 ÷9 ) x ( 49 ÷ 7 )
-5 x 7
-35 ►Respuesta