Вычислите:
1) 7+(-8)-(-12)-(-7)+12-20
2) 2 3\4-(-1 1\2)+(-5\6)-(-3\8)-4 2\3
1) 7+(-8)-(-12)-(-7)+12-20
2) 2 3\4-(-1 1\2)+(-5\6)-(-3\8)-4 2\3
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Ответ:
7+(-8)-(-12)-(-7)+12-20=7-8+12+7+12-20=0
2 3/4-(-1 1/2)+(-5/6)-(-3/8)-4 2/3=2 3/4+ 1 1/2-5/6+3/8-4 2/3=15/24=5/8
-19,6-4,6=-24,2
-6,6-(-12,3)=-6,6+12,3=5,7
2,8-5,3=-2,5