(1)4(x+1/4)-(2x-1/2);(2)2a2-3(5a2-b2)+7(a2+2b2).

问题描述:

(1)4(x+1/4)-(2x-1/2);(2)2a2-3(5a2-b2)+7(a2+2b2).

您好: (1)4(x+1/4)-(2x-1/2)=4x+1-2x+1/2=2x+3/2 (2)2a2-3(5a2-b2)+7(a2+2b2)=2a²-15a²+3b²+7a²+14b²=-6a²+17b² 如果本题有什么不明白可以追问,如果满意请点击...