1. S = 100+V·t
a) S = 100+5·3 = 115 (км).
б) 160 = 100+12·t => 12t = 160-100 => t = 5 (ч).
в) 145 = 100+V·15 => 15V = 145-100 => V = 3 (км/ч).
2.
а) (2³+5²)·3 = (8+25)·3 = 33·3 = 99.
б) (6²+3³):21 = (36+27):21 = 63:21 = 3.
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Answers & Comments
1. S = 100+V·t
a) S = 100+5·3 = 115 (км).
б) 160 = 100+12·t => 12t = 160-100 => t = 5 (ч).
в) 145 = 100+V·15 => 15V = 145-100 => V = 3 (км/ч).
2.
а) (2³+5²)·3 = (8+25)·3 = 33·3 = 99.
б) (6²+3³):21 = (36+27):21 = 63:21 = 3.