5 : 3
Р = 48 см
S = ?
2(5x + 3x) = 48
2 × 8x = 48
16x = 48
x = 48 ÷ 16
x = 3 см
5x = 5 × 3 = 15 см - длина
3х = 3 × 3 = 9 см - ширина
S = 15 × 9 = 135 см²
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5 : 3
Р = 48 см
S = ?
2(5x + 3x) = 48
2 × 8x = 48
16x = 48
x = 48 ÷ 16
x = 3 см
5x = 5 × 3 = 15 см - длина
3х = 3 × 3 = 9 см - ширина
S = 15 × 9 = 135 см²