計算下列各題,能簡便的要簡便計算

2021-03-04 05:04:31 字數 3005 閱讀 3272

1樓:手機使用者

(1)31 6

÷(1+1 3

×13 4

),=31 6

÷(1+1 3

×7 4

),=31 6

÷(1+7

12),

=19 6

÷1912

,=19 6

×1219

,=2;

(2)(

1 15

+217

)×15×17,

=1 15

×15×17+2

17×15×17,

=17+30,

=47;

(3)(9.6-101 2

÷1.25)÷(11 3

×0.75),

=(9.6-21 2

÷5 4

)÷(4 3

×3 4

),=(9.6-21 2

×4 5

)÷1,

=(9.6-8.4)÷1,

=1.2;

(4)5.66×7.28-3.

16×3.16-3.16×4.

12,=5.66×7.28-3.

16×(3.16+4.12),=5.

66×7.28-3.16×7.

28,=(5.66-3.16)×7.

28,=2.5×7.28,

=18.2;

(5)2012×0.875+201.2×1.25,=2012×0.875+2012×0.125,=2012×(0.875+0.125),

=2012×1,

=2012;

(6)1

1×2+1

2×3+1

3×4+…+1

99×100

,=1-1 2

+1 2

-1 3

+1 3

-1 4

+…+1

99-1

100,

=1-1

100,

=99 100.

計算下面各題,能簡便的用簡便方法計算 5/9+3又1/6÷(3又1/4-1又2/3)×1又1/2

2樓:叫啥知不道

5/9+3又1/6÷(3又1/4-1又2/3)×1又1/2=5/9+19/6*12/19*3/2

=5/9+3

=3又5/9

3.5×1又1/4+1.25×27/10+3.8/(4/5)=1.25*(3.5+2.7+3.8)

=1.25*10

=12.5

3.2/【(2又3/4-19/36)/(1/5+30%)』】=3.2/(40/9)

=0.72

數學1.計算題,能簡便的要簡便計算。1/3÷5/6÷16/15 【1-(1/5+1/6)】÷1/12 ( 5/6-3/4)÷(1/4-1/8)

3樓:書語蝶暴磬

1、計算題:

解:1/3÷5/6÷16/15

=1/3×6/5×15/16=3/8

[1-(1/5+1/6)]÷1/12 =[1-11/30]×12=19/30×12=38/5

(5/6-3/4)÷(1/4-1/8)=1/12÷1/8=1/12×8=2/3

應用題:

解:30÷5/6×8/9=36×8/9=32(千克)答:丙筐梨的質量是32千克.

計算下面各題,能簡便計算的用簡便方法計算 2-6/13÷9/26 (1/3+1/4)×36 6/7×(4/5-2/3)÷1/5

4樓:數學新綠洲

2-6/13÷9/26

= 2- (6/13)×(26/9)

=2- 4/3

=2/3

.(1/3+1/4)×36

=(1/3)×36 +(1/4)×36

=12+9

=21.

6/7×(4/5-2/3)÷1/5

=(6/7)×(4/5 - 2/3)×5

=(6/7)×(4 - 10/3)

=(6/7)×(2/3)

=4/7

.3/4-3/4×4/7+9/7

=(3/4)×(1- 4/7)+

9/7=(3/4)×(3/7)+9/7

=(1/4)×(9/7)+ 9/7

=(1/4 +1)×(9/7)

=(5/4)×(9/7)

=45/28

=1又17/28

數學1.計算題,能簡便的要簡便計算。1/3÷5/6÷16/15 【1-(1/5+1/6)】÷1/12 ( 5/6-3/4)÷(1/4-1/8)

5樓:牢廷謙籍念

1、計算題:

解:1/3÷5/6÷16/15

=1/3×6/5×15/16=3/8

[1-(1/5+1/6)]÷1/12 =[1-11/30]×12=19/30×12=38/5

(5/6-3/4)÷(1/4-1/8)=1/12÷1/8=1/12×8=2/3

應用題:

解:30÷5/6×8/9=36×8/9=32(千克)答:丙筐梨的質量是32千克.

計算下面各題,能簡便的要用簡便方法計算. 1.3+0.94+0.06+7.7 6.27÷0.3+3 12.5×0.48

6樓:你大爺

(1)1.3+0.94+0.06+7.7,=(1.3+7.7)+(0.94+0.06),=9+1,

=10;

(2)6.27÷0.3+3,

=20.9+3,

=23.9;

(3)12.5×0.48×0.8,

=(12.5×0.8)×0.48,

=10×0.48,

=4.8;

(4)5.2×[(1.3+2.1)÷0.2],=5.2×[3.4÷0.2],

=5.2×17,

=88.4.

計算下面各題,能簡便的要簡便計算3 72

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