Пошаговое объяснение:
1)
2) 2,64 -0,9 * 1,8= 2,64- 1,62=1,02
3) 12х -8у -7 при х= -5 , у= -3
12*(-5) -8*(-3) -7=-60 +24 -7= - 36 -7= - 43
4)
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Пошаговое объяснение:
1)
2) 2,64 -0,9 * 1,8= 2,64- 1,62=1,02
3) 12х -8у -7 при х= -5 , у= -3
12*(-5) -8*(-3) -7=-60 +24 -7= - 36 -7= - 43
4)