Ответ:
-2,5( -x + 2y)
-2,5 × ( -x ) - 2,5 × 2y
2,5x - 2,5 × 2y
2,5x - 5y
21( 5с + 1,5b)
21 × 5c + 21 × 1,5b
105c + 21 × 1,5b
105c + 31,5b
-(-10,6a + 6,2b) - (3,8b – 1,4a)
10,6a-6,2b-3,8b+1,4a
12a-6,2b-3,8b
12a-10b
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Ответ:
-2,5( -x + 2y)
-2,5 × ( -x ) - 2,5 × 2y
2,5x - 2,5 × 2y
2,5x - 5y
21( 5с + 1,5b)
21 × 5c + 21 × 1,5b
105c + 21 × 1,5b
105c + 31,5b
-(-10,6a + 6,2b) - (3,8b – 1,4a)
10,6a-6,2b-3,8b+1,4a
12a-6,2b-3,8b
12a-10b