1、429^2-171^2=__________.(分解因式啊)2、求证:对于正整数n,2^n+4-2^n能被30整除.3、已知m^2+2m+1=0,求m^3+2m^2+3m(要过程)4、计算:100^2-99^2+98^2-97^2+……+2^2-1最重要的是 2、求证:对于正整数n,2^n+4-2^n
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光学显微镜结构1、光学显微镜的结构(1)光学部分:______、______、______.(2)调节部分:______、______、______、______.(3)支持部分:______、______、______、______、______.2、显微镜的操作步骤:
常见化合物的化学式的写法(1)背出常见元素、原子团的化合物:(用符号填写)+1价:______、______、______、______;原子团______-1价:______、______、______、______;原子团______、______+2价:______
1、A:May I use your crayonB:Yes.______ ______ ______(填空)2、A:Glad to see you,Sue.B:______ ______ ______ ______ ,_______.(填空)A:______ ______ ______ ______ ______ _______ ,sirA:______ ______ ______ ______ ______ _______ ,sir B:I want to buy a
|-2k+1|______
|-2k+1|______
-9*2-3*4-|-1|=______
在横线上填上适当的词语,是句子完整1、 ______喜讯______传遍______校园2、 ______火车______穿过______山谷3、 ______园丁______培育______花朵
按“观”子的三种解释,分别写出三个字(1)看的意思.______ ______ ______ (2)景象或样子.______ ______ ______(3)对事物的认识或看法.______ ______ ______
按要求写四字成语(1)词语中带有描写颜色的的.例:花红柳绿 ______ ______ ______ ______ ______ ______ ______(2)词语中带有描写人物神态的.例:聚精会神 ______ ______ ______ ______ ______ ______ ______(1)
找规律填数字1,-2,4,______,______.
比较级和最高级(1)short ______ _________ (2)nice ______ _______ (3) white______ __________ (4)big ______ _______ (5)hot ______ __________ (6) easy ______ _______ (7)good ______ _______ (8)well ______ _______ (9) much ______ _______ (10) little
1、影响小车运动速度的原因有______、______、______等.2、要使小车运动的因素的增大______、减小______.
(句型转换) He is a good football player转换成什么?1) He ______ football very ______.2) He ______ ______ ______ _______ football.
写出下列单词的所有格形式.1、Alice ______ 2、pig ______ 3、students______4、Sam and Mike ______ 5、my friend ______ 6、chess ______
2、探究的一般过程是:______、______、______、______、______、_____.
1,He doesn't just chase and catch a ball.He can ______ ______ a ball and ______ ______ things.2,He hunts when I hide.He ______ ______ ______ me when I hide.
如图,AD、BE、CF是△ABC的三条角平分线,则∠1=______,∠3=1/2______,∠ACF=______.
如图,已知ab//cd,∠1=70°则∠2=______ ,∠3=______ ,∠4=______.