七年级数学上册第3章整式的加减3.3整式3.3.2多项式练习(新版)华东师大版.doc

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1、1第 3 章 整式的加减3.3 整式2.多项式1 对于下列四个式子:0.1; ; ; .其中不是整式的是( )x y2 2m 3A B C D2下列式子中,是多项式的有( B )xy21, , a, .x2 13 1a 1bA1 个 B2 个 C3 个 D4 个2 已知一个多项式是三次二项式,则这个多项式可以是( )A x22 x1 B2 x31C x22 x D x32 x214多项式 x2 x1 的各项分别是( )12A x2、 x、1 B x2、 x、112 12C x2、 x、1 D x2、 x、112 125下列说法中,正确的有( ) xy 的系数为 ;25 252 2a2b 的次数

2、是 5;多项式 m2n3 mn3 n1 的次数是 3; x y 和 都是整式12aA1 个 B2 个C3 个 D4 个6已知多项式 xm9 是三次二项式,则 m_7指出下列各多项式的项和次数2(1)a32 a2b ab23 b3;(2)3m42 m24.8下列各式中哪些是单项式?哪些是多项式?哪些是整式?x2 y2, x, ,10,6 xy1, m2n,2 x2 x5, , a7.a b3 1x 17 2x2 x92017昌平区校级期中指出下列多项式是几次几项式:(1)x3 x1;(2)x32 x2y23 y2.10如果整式 xn2 5 x2 是关于 x 的二次三项式,那么 n 等于( )A3

3、 B4 C5 D611已知单项式3 x4y3的次数与多项式 a25 am1 b a2b2的次数相同,求 m 的值312已知关于 x、y 的多项式 mx33 nx2y22 nxy( n2) x5 不含三次项和一次项,求 2m3 n 的值132017太仓市期中已知多项式( m3) x|m|2 y3 x2y2 xy2是关于 x、 y 的四次三项式(1)求 m 的值;(2)当 x , y1 时,求此多项式的值324142017烟台用棋子摆出下列一组图形:按照这种规律摆下去,第 n 个图形用的棋子个数为( )A3 n B6 n C3 n6 D3 n3参考答案1 C 2 B 3 B 4 B 5 B 6 3

4、7解:(1)多项式 a32 a2b ab23 b3的项有 a3、 2a2b、 ab2、3 b3;次数是 3.(2)多项式 3m42 m24 的项有 3m4、2 m2、4;次数是 4.8解: 、 的分母中含有字母,既不是单项式,也不是多项式,更不是整式1x 2x2 x单项式有 x、10、 m2n、 a7;175多项式有 x2 y2、 、 6xy1、2 x2 x5;a b3整式有 x2 y2、 x、 、10、6 xy1、 m2n、2 x2 x5、 a7.a b3 179解:(1) x3 x1 是三次三项式; (2)x32 x2y23 y2是四次三项式10 B 11解:3 x4y3的次数为 7.因为

5、单项式与多项式的次数相同,所以多项式的次数为 7,即 m27,解得 m5.12解:多项式中的三次项是 mx3,一次项是( n2) x.由题意,得 m0, n20,所以 m0, n2.当 m0, n2 时,2 m3 n20326.13解:(1)多项式( m3) x|m|2 y3 x2y2 xy2是关于 x、 y 的四次三项式,| m|234, m30,解得 m3.(2)当 x , y1 时,此多项式的值为326 (1) 3 (1)2 (1) 29 3 .32 (32)2 32 94 15414D 【解析】 第一个图需棋子 336;第二个图需棋子 3239;第三个图需棋子 33312;第 n 个图需棋子 3n3 枚.

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