упростите выражения: 1) -0,8а* 0,45b*(-с) 2)
упростите выражения:

1) -0,8а* 0,45b*(-с)

2) m(-0,75n)*(-0,6k)

3) 3(1,6x-0,7y)-1,8x+0,1y

4) -5(0,9m-1,1n)-1,5m+1,9n
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