( 5 класс )
Упростите выражение и найдите его значение :
1) 14а • 6b , если а = 2,b = 3
2) 25m • 3n , если m = 8 , n = 1
3) 5x + 8x - 3x, если x = 17
4) 16y - y + 5y, если y=23
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