A:delighted at
B:fed up with
C:concerned about
D:pleased with
⑴____ A.hot B.home
⑵____ A.lake B.snake
⑶____ A.cow B.window
⑷____ A.who B.what
正:5×12=60
逆:60÷12=____
①c×7=63
c=____
②d÷9=8
d=____
先化简,再求值(x+1)2﹣(x+2)(x﹣2),其中5<x<10,且x为整数.