计算: (1) ; (2) (简便计算). 答案:解: −12−(1−0.5)×12×[2−(−2)2]=−1−12×12×(2−4) =−1−14×(−2)=−1+12 =−12
−191819×19=(−20+119)×19=−20×19+119×19=−380+1=-379.2.听第6段材料,回答第6至8题.6.What does the woman want to buy?A.A sweater B.A shirt C.A coat7.Which color does the woman finally choose?A.Yellow B.Blue C.Green8.How much does the woman pay?A.170 yuan B.153 yuan C.155 yuan.