初一數學有理數混合運算習題

時間 2021-08-11 17:16:00

1樓:閭朋

①|-13|+|-53|+(-21)+|-3.5+3.5|

=13+53-21+0

=66-21

=45②(-3又4分之1)+(+3又3分之2)+(+2又4分之1)+(-1又3分之2)

=-3又4分之1+3又3分之2+2又4分之1-1又3分之2

=-3又4分之1+2又4分之1+3又3分之2-1又3分之2

=-1+2

=1 ③(-1×1/2)+(-1/2×1/3)+(-1/3×1/4)+......+(-1/2007×1/2008)

=(-1)[(1-1/2)(1/2-1/3)(1/3-1/4)+...+(1/2007-1/2008)]

=(-1)(1-1/2008)

=-2007/2008

④(-7.33)×(+42.07)+(-2.07)(-7.33)

=(-7.33)×(42.07-2.07)

=(-7.33)×40

=-293.2

⑤若設x=(-1/1996)^2005×1996^2006,y=(-5)^2005×(-6)^2005×(-1/30)^2004-34,求(x+y)^4的值,並用科學計數法表示結果 。

x=(-1/1996)^2005×1996^2006=(-1)^2005*1996^2006/1996^2005=-1996

y=(-5)^2005×(-6)^2005×(-1/30)^2004-34

=[(-5)*(-6)]^2005*(-1)^2004/30^2004-34

=30-34

=-4(x+y)^4=(-1996-4)^4=(-2000)^4=16×10^12 =1.6×10^13

夠多了,分給我吧。求.........

2樓:戀戰の帥

上面乙個也是我回答的,忘登陸了。我編了64道,到最後來不及寫答案了,sorry。

3+2^2×(-1/5)

解:原式=3+4×(-1/5)

=3-4/5

=11/5

18-6÷(-2)×(-1/3)

解:原式=18-(-3)×(-1/3)

=18-1

=17(-3)^2×[-2/3+(-5/9)]解:原式=9×(-11/9)

=-11

8+(-3)^2×(-2)

解:原式=8+9×(-2)

=8-18

=-10

100÷(-2)^2-(-2)÷(-2/3)解:原式=100÷4-3

=25-3

=2236×(1/2-1/3)^2

解:原式=36×(1/6)^2

=36×(1/36)

=112.7÷(-8/19)×0

解:原式=0

4×(-3)^2+6

解:原式=4×9+6

=36+6

=42(-3/4)×(-8+2/3-1/3)解:原式=(-3/4)×(-8+1/3)

=(-3/4)×(-23/3)

=23/4

(-2)^3-13÷(-1/2)

解:原式=(-8)-(-26)

=180-2^3÷(-4)^3-1/8

解:原式=0-8÷(-64)-1/8

=0+1/8-1/8

=0(-2)^3×0.5-(-1.6)^2÷(-2)^2解:原式=(-8)×(1/2)-(-8/5)^2÷4=(-4)-(64/25)÷4

=(-4)-16/25

=-116/25

(-3/2)×[(-2/3)^2-2]

解:原式=(-3/2)×(4/9-2)

=(-3/2)×(-14/9)

=7/3

[(-3)^2-(-5)^2]÷(-2)

解:原式=(9-25)÷(-2)

=(-16)÷(-2)

=816÷(-2)^3-(-1/8)×(-4)解:原式=16÷(-8)-1/2

=-2-1/2

=-5/2

39+[-23]+0+[-16]= 0

[-18]+29+[-52]+60= 19[-3]+[-2]+[-1]+0+1+2= -3[-301]+125+301+[-75]= 50[-1]+[-1/2]+3/4+[-1/4]= -1[-7/2]+5/6+[-0.5]+4/5+19/6= 1.25[-26.

54]+[-6.14]+18.54+6.

14= -81.125+[-17/5]+[-1/8]+[-0.6]= -323+(-73)

(-84)+(-49)

7+(-2.04)

4.23+(-7.57)

(-7/3)+(-7/6)

9/4+(-3/2)

3.75+(2.25)+5/4

-3.75+(+5/4)+(-1.5)

(-4)(+6)(-7)

(-27)(-25)(-3)(-4)

0.001*(-0.1)*(1.1)

24*(-5/4)*(-12/15)*(-0.12)(-3/2)(-4/3)(-5/4)(-6/5)(-7/6)(-8/7)

(-24/7)(11/8+7/3-3.75)*24(-78)+25+26+27

(-3)+(-2)+(-1)

39+28+26-125

[2/3-4-1/4+(-0.4)]+1/3+222+(-4)+(-2)+4-3

(-2)+7-(-16)-(-3)

(-5)-(+3)+(-9)-(-7)

(-1/4)+(-5/6)-(-1/3)+2/3-1/62/3+(-1/2)-(-1/3)+1/4(-5)+(-8)-(-2)-3

(-21)+(+16)-(-13)-(+7)+(-6)(-2/3)+(-1/3)+3/4+(-1/4)(-0.73)+(-0.62)-(+0.

75)(-19)+(-11)-(-33)+27

(-6.4)+(-3.6)-(-12.5)+4.5(-81)+(-19)-27+33

(-3.2)-(-6.2)+(-5.1)+(-4.9)(-6.9)+(-3.1)+(+2.7)+(-2.1)5+21+8/2-6-59

68/21-8-11-8+61

-2/9-7/9-56

4.6-(-3/4+1.6-4-3/4)

[2/3-4-1/4+(-0.4)]/1/3+222+(-4)+(-2)+4-3

-2+8-8-1/2+8/1/8

(2/3+1/2)/(-1/12)+(-12)2/(-2)+0/7-(-8)-(-2)

(1/4-5/6+1/3+2/3)/1/2

3樓:匿名使用者

3+2^2×(-1/5)

解:原式=3+4×(-1/5)

=3-4/5

=11/5

18-6÷(-2)×(-1/3)

解:原式=18-(-3)×(-1/3)

=18-1

=17(-3)^2×[-2/3+(-5/9)]解:原式=9×(-11/9)

=-11

8+(-3)^2×(-2)

解:原式=8+9×(-2)

=8-18

=-10

100÷(-2)^2-(-2)÷(-2/3)解:原式=100÷4-3

=25-3

=2236×(1/2-1/3)^2

解:原式=36×(1/6)^2

=36×(1/36)

=112.7÷(-8/19)×0

解:原式=0

4×(-3)^2+6

解:原式=4×9+6

=36+6

=42(-3/4)×(-8+2/3-1/3)解:原式=(-3/4)×(-8+1/3)

=(-3/4)×(-23/3)

=23/4

(-2)^3-13÷(-1/2)

解:原式=(-8)-(-26)

=180-2^3÷(-4)^3-1/8

解:原式=0-8÷(-64)-1/8

=0+1/8-1/8

=0(-2)^3×0.5-(-1.6)^2÷(-2)^2解:原式=(-8)×(1/2)-(-8/5)^2÷4=(-4)-(64/25)÷4

=(-4)-16/25

=-116/25

(-3/2)×[(-2/3)^2-2]

解:原式=(-3/2)×(4/9-2)

=(-3/2)×(-14/9)

=7/3

[(-3)^2-(-5)^2]÷(-2)

解:原式=(9-25)÷(-2)

=(-16)÷(-2)

=816÷(-2)^3-(-1/8)×(-4)解:原式=16÷(-8)-1/2

=-2-1/2

=-5/2

4樓:軍隊中尉

39+[-23]+0+[-16]= 0

[-18]+29+[-52]+60= 19[-3]+[-2]+[-1]+0+1+2= -3[-301]+125+301+[-75]= 50[-1]+[-1/2]+3/4+[-1/4]= -1[-7/2]+5/6+[-0.5]+4/5+19/6= 1.25[-26.

54]+[-6.14]+18.54+6.

14= -81.125+[-17/5]+[-1/8]+[-0.6]= -323+(-73)

(-84)+(-49)

7+(-2.04)

4.23+(-7.57)

(-7/3)+(-7/6)

9/4+(-3/2)

3.75+(2.25)+5/4

-3.75+(+5/4)+(-1.5)

(-4)(+6)(-7)

(-27)(-25)(-3)(-4)

0.001*(-0.1)*(1.1)

24*(-5/4)*(-12/15)*(-0.12)(-3/2)(-4/3)(-5/4)(-6/5)(-7/6)(-8/7)

(-24/7)(11/8+7/3-3.75)*24(-78)+25+26+27

(-3)+(-2)+(-1)

39+28+26-125

[2/3-4-1/4+(-0.4)]+1/3+222+(-4)+(-2)+4-3

(-2)+7-(-16)-(-3)

(-5)-(+3)+(-9)-(-7)

(-1/4)+(-5/6)-(-1/3)+2/3-1/62/3+(-1/2)-(-1/3)+1/4(-5)+(-8)-(-2)-3

(-21)+(+16)-(-13)-(+7)+(-6)(-2/3)+(-1/3)+3/4+(-1/4)(-0.73)+(-0.62)-(+0.

75)(-19)+(-11)-(-33)+27

(-6.4)+(-3.6)-(-12.5)+4.5(-81)+(-19)-27+33

(-3.2)-(-6.2)+(-5.1)+(-4.9)(-6.9)+(-3.1)+(+2.7)+(-2.1)5+21+8/2-6-59

68/21-8-11-8+61

-2/9-7/9-56

4.6-(-3/4+1.6-4-3/4)

[2/3-4-1/4+(-0.4)]/1/3+222+(-4)+(-2)+4-3

-2+8-8-1/2+8/1/8

(2/3+1/2)/(-1/12)+(-12)2/(-2)+0/7-(-8)-(-2)

(1/4-5/6+1/3+2/3)/1/2

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