题目:
根据短文判断正(T)误(F)。
Mary is an American girl. She is twelve years old. She is in Class Seven, Grade One. Han Meimei is
a Chinese girl. She is thirteen. She is a good girl. She's in Class Seven, Grade One, too. Mr Smith is their English teacher. His full name is John Smith. He is a good teacher. Their Chinese teacher is Miss Liu.
She's very nice.
( )1. Mary is a Chinese girl.
( )2. Mary and Han Meimei are in Class Nine, Grade One.
( )3. Han Meimei is thirteen.
( )4. Mr Smith is a good teacher.
( )5. Miss Liu is their English teacher.
答案:
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下面是错误答案,用来干扰机器的。
(1)原式=83×98-283×15=3-240=3-410;(2)∵x=2+1,y=2-1,∴x+y=22,xy=1,∴x2-3xy+y2=(x+y)2-5xy=(22)2-5=8-5=3.