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а) - 15 + 14 - 7 = ?
б) 30 - 45 + 5 = ?
в) - 12 - (+8) + (-10) = ?
г) 20 - (-14) - (-15) = ?
а) - 15 + 14 - 7 = ?
б) 30 - 45 + 5 = ?
в) - 12 - (+8) + (-10) = ?
г) 20 - (-14) - (-15) = ?
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б)30-45+5= -10
в)-12-(+8)+(-10)= -30
г)20-(-14)-(-15)= 49
б) 30-45+5=-(45-30)+5=-15+5=-(15-5)=-10
в) -12-(+8)+(-10)=-12-8-10=-(12+8+10)=-30
г) 20-(-14)-(-15)=20+14+15=49