3a^2+2ab-(a-2b)/3+(8a^2-12ab+a-b)/6,其中a=2,b=-3/2

问题描述:

3a^2+2ab-(a-2b)/3+(8a^2-12ab+a-b)/6,其中a=2,b=-3/2

3a²+2ab-(a-2b)/3+(8a²-12ab+a-b)/6=[9a²+6ab-(a-2b)]/3+(8a²-12ab+a-b)/6=[18a²+12ab-2(a-2b)]/6+(8a²-12ab+a-b)/6=(18a²+12ab-2a+4b+8a²-12ab+a-b)/6=(26a²-a+3b)/6...