【单选题】Writers paint pictures in words and use figurative languages to produce_______ in their description or narration.
【单选题】English writers are more “direct” than Chinese writers means that ______.
A.
Chinese writers don’t express their points in writing
B.
English writers often state the main idea at the end of a paragraph
C.
Chinese writers often express their purpose when they start an essay
D.
English writers often place their central idea in the introductory paragraph
【简答题】(A类)已知a 2 +2a+1=0,求2a 2 +4a-3的值. (B类)已知a 2 +b 2 +2a-4b+5=0,求2a 2 +4b-3的值. 我选做的是______类题.
【单选题】English writers are more “direct” than Chinese writers means that ______.
A.
Chinese writers don’t express their points in writing
B.
English writers often state the main idea at the end of a paragraph
C.
English writers often place their central idea in the introductory paragraph
D.
Chinese writers often express their purpose when they start an essay
【简答题】已知:a 2 ﹣b 2 =(a﹣b)(a+b);a 3 ﹣b 3 =(a﹣b)(a 2 +ab+b 2 );a 4 ﹣b 4 =(a﹣b)(a 3 +a 2 b+ab 2 +b 3 );按此规律,则: (1)a 5 ﹣b 5 =(a﹣b)( _________ ); (2)若a﹣ =2,你能根据上述规律求出代数式a 3 ﹣ 的值吗?
【简答题】已知:a 2 -b 2 =(a-b)(a+b);a 3 -b 3 =(a-b)(a 2 +ab+b 2 );a 4 -b 4 =(a-b)(a 3 +a 2 b+ab 2 +b 3 );按此规律,则: (1)a 5 -b 5 =(a-b)(______); (2)若a- 1 a =2,你能根据上述规律求出代数式a 3 - 1 a 3 的值吗?
【简答题】先化简,再求值: (1)(4a 2 -3a)-(2a 2 +a-1)+(2-a 2 +4a),其中a=2. (2)已知A=3a 2 -5ab-b 2 ,B=-2a 2 +3ab+b 2 ,其中a=-1, b= 2 3 ,求-3(A-B)+2(B+3A)的值.