2021年北師大版七年級數(shù)學(xué)下冊1.2冪的乘方與積的乘方自主學(xué)習(xí)同步練習(xí)題2

1、2 3 62 3 62 32 3 3 33 2 3 62 3 62 32 3 3 33 2 3 3 4 122 2 2 23 2 63 3 3 4 2 2201920203 3 3 3 3 3 3 34 4 5 2 102 22020 2019201920202021 年師版年數(shù)下 1.2 冪的方積乘自學(xué)同練習(xí) 2（附案 A2a +3a C x Bab a b D Aa+232Ba aC abD A Ba aCa +a aD ab A C x x Bxy 9x y D A1 B3 CDAxB9xC9xD27x Ab 2C ） a4 A4 B10.25 B a aD aC4 D1 2 3 +m

2、n 2020 20192 2019m 2 m 2 m 2020 20192 2 x y 3 x+10y3 xm 2 3 +m n 2020 20192 2019m 2 m 2 m 2020 20192 2 x y 3 x+10y3 xm n3 2 5m m 4 m n 2 +3nA1 B+1 C+4 D10 2 A4 B3 C D8 a 12 13 4 0.25 14 2b4ab 15 0.25 16 3ab 17 32 y 2 18 4 x 190 20 a +a 21 a m b a a a 3 81 312 2 3 23T T222 a 5a 2 am nn 22 nm n m +n3

3、m nn 22 nm n m +n3 2 2x +32 2 x m3 n+1 n 3 2 3a b c 2 22 23 m+24 2 x 4x 2x 24 3 2 x 7 7x x 25 2 ab 26 y xy1 2a3 3 27x n 28 c 2a ab 2 3 2 2 2 3 2 3 2 2 2 3 62 2 3 53 3 2 63 4 3 4 72 2 22 3 2 3 3 3 4 72 2參考答案a +3a a B 9 C x D a +2aa a a B ab a D a B a Ca a D a a b B 27 y C x x D 9x 20192020 2019201920

4、193 3 3 3 64 4 85 2 5 20192020 2019201920193 3 3 3 64 4 85 2 5 102 2019 20192019201920192 +1 m 22 4 2 4 3 + 3 m D 2 2 1 27x b A a a B aaa C 2 D C4 40.25 4 C 4 4D10 +4 2 2 32 32 32 m2Ca a a 54 34 42019 201920192 20192 2019 m 22019 201920192 20192 2019 m 2m 2 m 2019 201920192 2 3 3 4y 5 y 5 a 3 23 3 2

5、 3 3 2120.25 0.25 0.25 13 4 4 0.258 4 8 102414 a b b b 4 416646415 0.25 4416ab 9 18a 18a 17 b2 2 2+10y 3 x 3 5 2 18 x2 2 6 x15 xm 6 x15 xm n m 2 m+2n8 8 106 4 m m 2 2 x15 15190m+2n32 4 2 2 20 a a21 T22 16 13 T2 T2 7 m+n T2+T2Tm n 2 +3n m 3 2 3 2 m n 2 +3n m 3 2 3 2 m n n m+2n 4n 2 2 m n + n2 n 2 22 32 3 2 4 x x +32 nn n 2n 2n n 222 a 2a 2 200232 4 2 2 162x x 4 2 24 a a a 2362 7x 3x 7x 7 377 32401225425 2x2 ab ab b 26 xy a a2x mx y mx mx y mx n+3n6 2 2 3a a b b b c c ca 22 aa2|a+1|2aa+1+133 9 3 3 x+2ym x+2a 43a 22a5a 5m527x xx 3n+3n 1n 28 2 2 5 3 5 2ab