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  • 三年級(jí)寒假作業(yè)答案數(shù)學(xué)

    時(shí)間:2022-07-19 19:16:03 寒假作業(yè) 我要投稿

    2017年三年級(jí)寒假作業(yè)答案數(shù)學(xué)

      下面由yjbys小編為大家整理的三年級(jí)寒假作業(yè)答案數(shù)學(xué),歡迎大家閱讀與借鑒!

    2017年三年級(jí)寒假作業(yè)答案數(shù)學(xué)

      8.1答案

      問(wèn)題導(dǎo)學(xué)

      問(wèn)題1 問(wèn)題2(1) (2) 問(wèn)題3 全是錯(cuò)的

      問(wèn)題探究

      問(wèn)題1(1) (2) (3) (4) 問(wèn)題2(1) (2)243 (3) 問(wèn)題評(píng)價(jià)

      1. B 2.C 3.A

      4.(1)ab (2) (3)3,5,6

      5.(1) (2) (3)0

      6. (噸)

      8.2 冪的乘方和積的乘方(1)答案

      【問(wèn)題導(dǎo)學(xué)】

      問(wèn)題1.計(jì)算:

      (1) (2) (m是正整數(shù)); (3) (4)

      問(wèn)題2.計(jì)算:

      (1) (2)

      問(wèn)題3.下面的計(jì)算對(duì)不對(duì)?如果不對(duì),應(yīng)怎樣改正?

      (1)錯(cuò) (a5)2=a10; (2)錯(cuò)a5·a2=a7; (3)對(duì) (x6)3=x18; (4)錯(cuò)(xn+1)2=x2n+2.

      【問(wèn)題探究】

      問(wèn)題1.(1)若4·8m·16m =29,則m= 1 .

      (2)如果2a=3,2b=6,2c=12,那么a、b、c的關(guān)系是 a

      問(wèn)題2.計(jì)算:

      (1)(-x2)·(x3)2·x= (2)[(x-y)3]4= (3)[(103)2]4=

      【問(wèn)題評(píng)價(jià)】

      1.C

      2.C

      3.計(jì)算:

      (1) (2) (3) (4) 4.計(jì)算:(1) (2) 5.(1)5400

      (2)1

      8.2 冪的乘方和積的乘方(2)答案

      問(wèn)題導(dǎo)學(xué):

      問(wèn)題1:(1)216,216

      (2)-216,-216

      (3)- ,- 問(wèn)題2:(3)(3×2)n =3n×2n,(ab)n =an×bn

      問(wèn)題3: (ab)n =anbn

      (abc)n=anbncn

      問(wèn)題探究:

      問(wèn)題1. (1)(5m)3 =53m3 =125 m3

      (2)(-xy2)3=-x3(y2)3 =-x3y6

      (3)(3xy2)2= 32 x2 (y2)2 =9 x2 y4

      (4)(-2ab3c2)4 =(-2)4 a4 (b3)4 (c2)4

      =16 a4 b12 c8

      問(wèn)題2.計(jì)算:

      (1) =( × ) 2000 × ( )2 =

      (2) =(-0.125×4) 5 × 45 =-32

      (3) = + -9 = -7

      (4) = =

      問(wèn)題評(píng)價(jià)

      1.計(jì)算:

      (1) =- a3b3 (2) = x8y12

      (3) =4 × 106 (4) =(-2)3 (a3 ) 3 (y4 ) 3 =-8a9y12

      2.計(jì)算:(1) =4

      (2) =97 =-1

      3.若 ,則 -3 a3bc2;若 ,則 2ab2 或-2ab2.

      4.已知 ,求 的值.

      解: =(-1)2n x2ny2n

      = (xn )2 (yn) 2

      = 52×(-2)2

      =25×4

      =100

      8.3 同底數(shù)冪的除法(1)

      問(wèn)題導(dǎo)學(xué)

      1.(1)―( )5 (2)―x12 (3)27x6 (4)5x2

      2.計(jì)算下列各式:

      (1) = = (2) = 9

      (3) = a3

      (4) = a30

      3.歸納法則:

      同底數(shù)冪的除法:同底數(shù)冪相除,底數(shù)不變,指數(shù)相減.

      4.(7.9×103)×3600÷1000÷(1.0×103)=28.44倍

      問(wèn)題探究

      問(wèn)題1.計(jì)算:

      (1) (2) (3) (4) =x6 = ―a3 = a3b3 = p2m―1

      問(wèn)題2.計(jì)算:

      (1) (2) = x+y = x4y6z2

      (3) (4) = 54m÷52m-1 = a9

      = 52m+1

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