Ответ:
1) 5(3-2a)+7(3a-1)=15-10a+21a-7=8+11a
2)3m(m-2)-5m(7-t)=3m²-6-35m+5mt
3)3(2x-8)-3(2x-5)=6x-24-6x+15=-9
4)2a(3a-5)+4a(a+3)=6a²-10a+4a²+12=10a²-10a+12
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Ответ:
1) 5(3-2a)+7(3a-1)=15-10a+21a-7=8+11a
2)3m(m-2)-5m(7-t)=3m²-6-35m+5mt
3)3(2x-8)-3(2x-5)=6x-24-6x+15=-9
4)2a(3a-5)+4a(a+3)=6a²-10a+4a²+12=10a²-10a+12