乘法分配律试题及答案

乘法分配律

“y

-0.843XJA0.157x3—5Jx4ft

49

1'1

-3-7-3—x(-9

66

-125如

24

(1)鼓8管金⑵(~H■卜

，3:r

.•-/i••.4.•A••••

—鹤

24

⑶山子目”-)14)5)*44-01)：

⑸(-gMPVW)(6)-12x^21-1y+1»粉

⑺裕焉(8)(-20)x借VW"。

2能力提升

(1)(-357)x(-3)+(-357)x(+5)+(-357)x(-2)

(2)3.55■-2.87x(―^~)+(-x6.42

(3)(-370)x(T)+0.25x24.5+(-5yjx(-25%)

(4)-5xf-3yl+6xf-3yl+3y

2.21..5

(5)-7.8+3.4-(6)-13x—o.34xy+yX(-：13r)与.«0.34

3.拓展突破

⑴(-101)x(-9.9)

(3)-71^x(-8)(4)192y4-^~^

10

1.基础巩固

⑴3(8-丁一司

334314

解:原式二;X8■一，x一.一X一'

443415

=6-1-0.7

=4.3

⑵卜卷一卷卜24

解:原式+幼乂24-在24

=(-20)-15

二一35

⑶GH4>9)

解:原式=枭(-24)-、(-24)-3(-24)

1248

=(-2)-(-6)-(-3)

=-2+6+3

=7

(4)(-100)x(±-±+±-0.1)

31

解:原式=(-100)x而-(-100)X—+(-100)x

-^—(-100)x0.1

=(-30)-(-50)+(-20)-(-10)

=-30+50-204-10

=10

(5)(-%)x%3—高

解:原式=(-36)X---(-36)x3-(-36)x~^~+

57

(-36)x--(-36)x—

=(-18)-(-108)-(-20)+(-30)-

(-21)

=-18+108+20-30+21

=101

(6)-12x(2-J--ly+ly-l^)

937

解:原式=(-12»7-(-12»E+(-12”不

S端

=(-27)-(-18)+(-14)-(-13)

=-10

⑺(卷

解:原式=(卷-小总裔x(-60)

=(-35)-(-16)+(-50)-(-45)

=-24

(8)(-2O)x(li-A+AJx(-6)

解:原式=(^~+y)x(-6)x(-20)

/II53、…

\1264I

=?x120-^-x120+^x120

1264

=110-100+90

=100

2.能力提升

(1)(-357)x(-3)+(-357)x(+5)+(-357)x

(-2)

解:原式=(-357)x[(-3)+(+5)+(-2)]

.=(-357)x0

=0

(2)3.55x---2.87x|—―j---jx6.42

解：原式=3.55x-^-+2.87x———x6.42

=(3.55+2.87-6.42)x-1-

=0

(3)(-370)x卜十)+0.25x24.5+卜5g卜

(-25%)

1111

解：原式二370x—+—X24.5+5—x—

441Q

■=(370+24.5+5yjxy

=100

(4)-5x^-3-yj+6x^-33卜3与

解:原式=5x3~~-6x3§+3—x1

777

=(5-64-1)x34-

7：，：•.・.

=0x33：

/

=0

(5)-7.8+3.4-卜9卜,-卜5)7.4

解:原式=-7.8x^-(-y)xH~(~f)x^

.《7.844)x盘

\77/17

5.

="-6.8x——•

17

=-2

2215

(6)-13x-o.34xy+yx(-13)-x0.34

212

解:原式=(-13)x—+—x(-13)-0.34x--

4-x0.34

7

=(-13)x信用-0.34x(„)

=-13-0.34

=-13.34

3.拓展突破

⑴(-101)x(-9,9)

解:原式=101x9.9

=(100+1)x9.9

=990+9.9

=999.9

(3)-71^x(-8)

1O

解:原式=713(8

1.16.；广

•I**•・・•\

=(72篇X8

=72x8-x8

=576-0.5

=575.5

(4)192方+(^^~)

=-336+(-1)

=-337

⑸[I+信+/寄”2小5

解:原式二[1-----^-x(-24)2-x(-24)+-j-x

L4864

(-24)卜5

=(199+4-18)+5

=——3

4

解：原式=4X,.854-36+6.15X3yj-

4

(75719VA

I-x—+—x----5.5I

\4S421/1

=yx(4.85x3.6-3.