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        共贏教育網(wǎng) >百科大全 > 2019年三年級(jí)寒假作業(yè)答案數(shù)學(xué)

        2019年三年級(jí)寒假作業(yè)答案數(shù)學(xué)

        更新時(shí)間:2020-07-04 來(lái)源:百科大全 投訴建議

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          下面由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!

          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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