北师大版七年级数学下册第一章课后练习题集.docx

;y42n==;12=3aa3=;a2na=;(a3)()a2a14;323=;c若(a3)n=(an)m(m,n都是正整数),则m=():(对的打“√”,错的打“×”)235()x2x362aaax()(x)3若m、n、p是正整数,则(aman)p等于((1)p(p)423(2)-(a)1638xy5)a428x(aa())..ampan(3)(-a2)3(4)34()34237;6(6)[(x)]232 n n 2 2 3 3 2 7 3 3(7)(x)-(x) (8) (-a)·a+(-4a)·a-5(a) x2m 2,求x9m的值。:(每小题2分,共16分)(-a2)3·(-a3)2的结果是().-a12C.-a10D.-(9n)2=38,则n的值是()(p)8(p2)3[(p)3]2的结果是()A.-.-,则x=:5p342324p52p2pn n 22 m+1 2 166.①若2·8·16=2,求正整数m的值.②若(9 )=3,.(-3×103)3=________;122;2(abc)=________333(24)3=________;(22)-(2xyax);(a200;(3a2)3(a2)2a22(3)200=,yn7,则(xy)n=;(x2y3)n=(3a2b3)3,正确的结果是(4.)():3=) a2 a14(ab3)2ab6();(6xy)212x2y2();(2b2)24b4();ama4a4m():(每题4分,共28分)(1)x3x2(2)x3y3m224(3)3pq(4)-(xyz)(5)(x2y)3(xy3)2 (6)xy3n2 xy6n (7)x2y34 x8y628.(1)已知xn=5,yn=3,求(xy)2n的值.(2)已知4·8m·16m=29,求m的值。.(x2yn)2(xy)n1=_______;()n4na2nb3n;(pq)35(pq)72=。2..设(xm-1yn+2)·(x5my-2)=x5y3,.-.-(2332733(2)(an)2(2bn)3[(a2b3)]n1)(3a)a(4a)a(5a)同底数幂的除法下列运算结果正确的是()3235213③(-x)633④()-2-?1①2x-x=x②x·(x)=x÷(-x)=x×10=10A.①②B.②④C.②③D.②③④2.(abc)5÷(abc)3=。xn+1·xn-1÷(xn)2=.3.[(mn)2(mn)3]2(mn)4=,那么m=