計算下面各題,能簡算的要簡算,並寫出主要的計算過程7 8 8 75 2 2 1 25nb

2021-04-21 09:01:39 字數 6296 閱讀 3473

1樓:小勝k坼

①dao7.8-8.75+2.2-1.25=(版7.8+2.2)權-(8.75+1.25)=10-10

=0②13.2÷(9.4-5)+5.32

=13.2÷4.4+5.32

=3+5.32

=8.32

③7-37-4

7=7-(37+4

7)=7-1

=6④13

17-(5

17+1

10)=1317

-517

-110

=817

-110

=63170⑤15

+(56

-1318)=1

5+(15

18-1318)

=15+19

=1445

計算下面各題,能簡算的要簡算1.25×0.7×0.8 &nb...

2樓:樂事疊合呼

首先要觀察有沒有共同項,有的話就用結合定律,有時候也可以把數拆分來找規律的,回沒有的話一定會有特答俗的運算,比如125x8、25x4等等。一般都是有規律的,還需要平時多多積累。

(1)1.25×0.7×0.8

=(1.25×0.8)×0.7

=1×0.7

=0.7

(2)0.65×202

=0.65×(200+2)

=0.65×200+0.65×2

=130+1.3

=131.3

(3)1.25+4.6+0.75

=(1.25+0.75)+4.6

=2+4.6

=6.6

(4)6.1×3.6+3.6×3.9

=(6.1+3.9)×3.6

=10×3.6

=36(5)16.8÷(7.34-6.54)=16.8÷0.8

=21(6)2.7÷1.25÷8

=2.7÷(1.25×8)

=2.7÷10

=0.27

3樓:匿名使用者

=1 x 0.7

=0.7

(1.25 x 0.8 = 1000 x 0.001)

4樓:手機使用者

(1)1.25×

0.7×0.8

=(du1.25×0.8)zhi×0.7

=1×0.7

=0.7

(2)0.65×202

=0.65×(200+2)

=0.65×200+0.65×2

=130+1.3

=131.3

(3)1.25+4.6+0.75

=(1.25+0.75)+4.6

=2+4.6

=6.6

(4)6.1×3.6+3.6×3.9

=(6.1+3.9)×3.6

=10×3.6

=36(5)16.8÷dao(7.34-6.54)=16.8÷0.8

=21(6)2.7÷1.25÷8

=2.7÷(1.25×8)

=2.7÷10

=0.27

5樓:夜依舊清

1.25*0.7*0.8=1.25*.0.8*0.7=1*0.7=0.7

計算下面各題(能簡算的要簡算)48-2.3×1250×(0.8+0.4)7.34×2.1+7.34×7.8+7.34×1.120.5÷1.25÷0.

6樓:淹了學校

①48-2.3×12,

=48-27.6,

=20.4;

②50×(0.8+0.4),

=50×0.8+50×0.4,

=40+20,

=60;

③7.34×2.1+7.34×7.8+7.34×1.1,=7.34×(2.1+7.8+1.1),

=7.34×10,

=73.4;

④20.5÷1.25÷0.8,

=20.5÷(1.25×0.8),

=20.5÷1,

=20.5;

⑤(8.1-5.4)÷3.6+85.7,

=2.7÷3.6+85.7,

=0.75+85.7,

=86.45;

⑥9.88×9+9.88,

=9.88×(9+1),

=9.88×10,

=98.8.

計算下面各題,能簡算的要簡算。。

7樓:樂為人師

2.5×32×12.5

=(2.5×4)×(8×12.5)

=10×100

=1000

7/9÷11/5+2/9×5/11

=7/9×5/11+2/9×5/11

=(7/9+2/9)×5/11

=1×5/11

=5/11

3/5÷【(1/5+1/3)÷2/9】

=3/5÷【8/15÷2/9】

=3/5÷12/5

=1/4

678-192÷8×12

=678-24×12

=678-288

=390

8×(7/8-5/9)×9

=8×7/8×9-8×5/9×9

=63-40

=232.解方程或解比例。

3/4x+x=1.4

解:1.75x=1.4

x=1.4÷1.75

x=0.8

8樓:瀧穆招高旻

106乘22加78除以13

=106×(20+2)+6

=2120+212+6

=2338

100乘11分之3減3除以11

=100×3/11-3×1/11

=300/11-3/11

=297/11

=27(0.75加2.5)除以0.5加9.8=3.25×2+9.8

=6.5+9.8

=16.3

5分之7乘【(4分之3加3分之1)減14分之13】=7/5×(13/12-13/14)

=7/5×13×(1/12-1/14)

=91/5×1/84

=13/60

計算下面各題,能簡算的要簡算:2000-197,41*102,5分之1/25分之6-7分之2*32分之7,1042-384/16*13,

9樓:匿名使用者

2000-197=2000-(197+3)bai+3=1803(這題先把數字分解du成簡zhi單dao

好算的專數就可以了)屬

41*102=41*(100+2)=4182(這題先把數字分解成簡單好算的數就可以了)

1/5 / 6/25-2/7*2/32=5/6-1/16=37/48(先約分,再通分分母就好算了)

1042-384/16*13=730(簡便就是先把384除以16在簡算)

8.8-6.75+9.2-0.25=(8.8+9.2)-(6.75+0.25)=11(這題盡量把小數換位置加或減成好算的數就簡便)

0.8*3.6-0.8*0.6=0.8*(3.6-0.6)=2.4(這類題,提出相同的數再乘法或加減法)

(7/12+3/8-23/24)*24=(14/24-9/24+23/24)*24=0(這類題,先盡量把分母通分成和乘數一樣的數字就簡算了

4.86*1/(2.1-2.09)=4.86*1/0.01=4.86*1*100/0.01*100=486(先把分數的算了,在給分子分母同時乘以100就簡算)

希望能幫到你,但是要注意學習方法,你掌握的計算的方法就會簡便運算了,祝你學業有成!

10樓:手機使用者

這個要怎麼個算,搞不懂,你是哪個年級的?

計算下面各題,能簡算的要簡算. 8.5×(2.36+2.42)÷0.25 3.9÷1.3×6 4.25×6.3+3.7×4.25 2

11樓:手機使用者

(du1)8.5×

zhi(2.36+2.42)÷0.25,

=8.5×4.78÷0.25,

=40.63÷0.25,

=162.52;

dao(2)3.9÷1.3×6,

=3×6,

=18;

(3)4.25×6.3+3.7×4.25,=4.25×(6.3+3.7),

=4.25×10,

=42.5;

(4)205×99,

=205×(100-1),

=205×100-205×1,

=20500-205,

=20295;

(5)25.6-7.49-2.51,

=25.6-(7.49+2.51),

=25.6-10,

=15.6;

(6)2.5-(6.8-4.9)×0.8,=2.5-1.9×0.8,

=2.5-1.52,

=0.98.

計算下面各題,能簡算的要簡算

12樓:du知道君

2.5×

32×12.5 =(2.5×4)×(8×12.

5) =10×100 =1000 7/9÷11/5+2/9×5/11 =7/9×5/11+2/9×5/11 =(7/9+2/9)×5/11 =1×5/11 =5/11 3/5÷【(1/5+1/3)÷2/9】專 =3/5÷【8/15÷2/9】 =3/5÷12/5 =1/4 678-192÷8×12 =678-24×12 =678-288 =390 8×(7/8-5/9)×9 =8×7/8×9-8×5/9×9 =63-40 =23 2.解方屬程或解比例。 3/4x+x=1.

4 解:1.75x=1.

4 x=1.4÷1.75 x=0.8

計算下面各題,能簡算的要簡算。(脫式計算) (6/35+4/21)÷4/7 2/ 50

13樓:匿名使用者

(6/35+4/21)÷4/7

=6/35×7/4+4/21×7/4

=3/10+1/3

=9/30+10/30

=19/30

2/9÷2/7÷14/15

=2/9×7/2×15/14

=14/18×15/14

=5/6

(5/6-3/4)÷5/12+4/5

=5/6×12/5-3/4×12/5+4/5=2-9/5+4/5

=2-13/5

=-3/5

3/10÷(4/5-1/2)

=3/10×5/4-3/10×2

=3/8-3/5

=15/40-24/40

=-9/40

2/25÷3/7+23/25÷3/7

=(2/25+23/25)÷3/7

=1×7/3

=2又1/3

8/9÷5/6+1/6

=8/9×6/5+1/6

=16/15+1/6

=32/30+5/30

=37/30

=1又7/30

2/3x=16

x=16×3/2

x=24

3/4x+1/4=3/8

3/4x=3/8-1/4

3/4x=1/8

x=1/8×4/3

x=1/6

1/5x-1/2=3/10

1/5x=1/2+3/10

1/5x=8/10

x=8/10×5x=4

14樓:**防騙

6/35x7/4十4/2lx7/4=3/10十1/3=9/30十10/30=19/30

2/9x7/2x1/14=1/185/6

計算下面各題,能簡算的要簡算 14×75-624÷39(7.6-3.6÷2)×1.545-(45-12)4.68×78+

15樓:奮兒

(1)14×75-624÷39,

=1050-16,

=1034;

(2)(7.6-3.6÷2)×1.5,

=(7.6-1.8)×1.5,

=5.8×1.5,

=8.7;

(3)4

5-(45-1

2),=45

-45+12

,=0+12,

=12;(4)4.68×78+4.68×22,

=4.68×(78+22),

=4.68×100,

=468.

計算下面各題,能簡算的要簡算。,一計算下面各題,能簡算的要簡算。

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