помогите решить пожалуйста!
1)-0,8а*0,45b*(-c)
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
1)-0,8а*0,45b*(-c)
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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4)-4,5m+5,5n-1,5m+1,9n=7,4n-6m.