70道整式的乘除计算题及答案,很急,拜托了!答:70道整式的乘除计算题及答案,很急,拜托了! 1,(2a+3b)²=4a²+12ab+9b², 2,(a+2b)(3a+b)=3a²+7ab+2b², 3,(a-2b)(3a+b)=3a²-5ab-2b², 4,(a+2b)(3a-b)=3a²+5ab-2b², 5,(a-2b)(3a-b)=3a²-7ab+2b², 6,(a+2b)(3a+b+2c)=3a²+7ab+2b²...
70道整式的乘除计算题及答案,很急,拜托了!!答:1,(2a+3b)²=4a²+12ab+9b²,2,(a+2b)(3a+b)=3a²+7ab+2b²,3,(a-2b)(3a+b)=3a²-5ab-2b²,4,(a+2b)(3a-b)=3a²+5ab-2b²,5,(a-2b)(3a-b)=3a²-7ab+2b²,6,(a+2b)(3a+b+2...