班级 姓名 成绩 一、选择题: 1.下列各式中 ,正确的是( ) A.t5·t5 = 2t5 B.t4+t2 = t 6 C.t3·t4 = t12 D.t2·t3 = t5 2.下列计算错误的是( ) A.?a2·(?a)2 = ?a4 B.(?a)2·(?a)4 = a6 C.(?a3)·(?a) 2 = a5 D.(?a)·(?a)2 = ?a33.下列计算中,运算正确的个数是( ) ①5x3?x3 = x3 ② 3m·2n = 6m+n ③am+an = am+n ④xm+1·xm+2 = xm·xm+3 A.1 B. 2 C.3 D.44.计算a 6(a2)3的结果等 ( ) A.a11 B.a 12 C.a14 D.a365.下列各式计算中,正确的是( ) A.(a3)3 = a6 B.(?a5)4 = ?a 20 C.3 = a15 D.3 = a66.下列各式计算中,错误的是( ) A.(m6)6 = m36 B.(a4)m = (a 2m) 2 C.x2n = (?xn)2 D.x2n = (?x2)n7.下列计算正确的是( ) A.(xy)3 = xy3 B.(2xy)3 = 6x3y3 C.(?3x2)3 = 27x5 D.(a2b)n = a2nbn8.下列各式错误的是( ) A.(23)4 = 212 B.(? 2a)3 = ? 8a3 C.(2mn2)4 = 16m4n8 D.(3ab)2 = 6a2b29.下列计算中,错误的是( ) A.mn·m2n+1 = m3n+1 B.(?am?1)2 = a 2m?2 C.(a2b)n = a2nbn D.(?3x2)3 = ?9x6 10.下列计算中,错误的是( ) A.(?2 ab2)2·(? 3a2b)3 = ? 108a8b7 B.(2xy)3·(?2xy)2 = 32x5y5C.( m2n)(? mn2)2 = m4n4 D.(? xy)2( x2y) = x4y3 11.下列计算结果正确的是( ) A.(6ab2? 4a2b)?3ab = 18ab2? 12a2b B.(?x)(2x+x2?1) = ?x3?2x2+1C.(?3x2y)(?2xy+3yz?1) = 6x3y2?9x2 |