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d)-3a( ⅓-a)=-a+3a²
g) m(2m+3)=2m²+3m
b) -4(x+y)=-4x-4y
e) (t-2s-1)×7=7t-14st-7
h) 3p(2r+5p-1)=6pr+15p²-3p
c) -5(-x+1)=5x-5
f) ½ (2a-4b+1) =a-0,5b+1
i) xy(2x-3y+5) =2x²y-3xy²+5xy