Bài 2: Thực hiện phép tính

a) (-5) + (-12)  = -17        d) 12 - 11 +15 - 27 +11 = 2

b) (-9) +12   = 3              e) 1032 - [314 -(314 +32)] = 1000

c) 9 -12     = -3                g) [(-18) +(-7) ] + 15 = -10

a, -17                                                           d, 12 - 11 + 15 - 27 + 11                      e , 1032 - [314 - ( 314 + 32 )] 

b , 3                                                                 = 12 - 11 + 15 - 27                               = 1032  - [ 314 + ( -314) + 32 ]

c, -3                                                                 = -11                                                    = 1032  - 32 

                                                                                                                                    = 1000 

g , -10    ( CÂU  A , B , C , G  RẤT DỄ NÊN GIRL CHỈ VIẾT DÁP ÁN CÒN CÂU D VÀ E GIRL VIẾT CÂU BÀI LÀM + ĐÁP ÁN ĐÓA NHA NHỚ K VÀ KB NẾU CÓ THỂ

a) 1032 - [ 314 - ( 314 + 32)]

= 1032 - [ 314 - 314 -32 ]

= 1032 - [ 0 - 32 ]

= 1032 - (-32)

= 1032 + 32 =1064

b) 12 - 11 + 15 - 27 + 11

= 12 + (-11) + 15 +(-27) +11

= [ 12 + 15 + (-27)] + [ (-11) + 11]

= 0 + 0 = 0

a) 1032 - [314 - (314 + 32)]

=1032 - 314 + (314 + 32)

=1032 - 314 +314 + 32

=1032 +32=1064

b)12 - 11 + 15 - 27 +11

=12- 27 - 11 +11 +15

= -15 - 0 + 15

= -15+15 +0=0+0=0

1) \(\left(+15\right)+\left(+17\right)=15+17=32\)

2) \(\left(-3\right)+\left(-7\right)=-3-7=-\left(3+7\right)=-10\)

3) \(\left(-25\right)+\left(+4\right)=-25+4=-\left(25-4\right)=-21\)

4) \(\left(-6\right)+\left(-54\right)=-6-54=-\left(6+54\right)=-60\)

5) \(\left(-15\right)+20=20-15=5\)

6) \(\left(-5\right)+8+7+5\)

\(=\left(-5+5\right)+\left(8+7\right)\)

\(=15\)

7) \(\left(-8\right)+\left(-11\right)+\left(-2\right)\)

\(=\left[\left(-8\right)+\left(-2\right)\right]+\left(-11\right)\)

\(=\left(-10\right)+\left(-11\right)\)

\(=-21\)

8) \(15+\left(-5\right)+\left(-14\right)+\left(-16\right)\)

\(=\left[15+\left(-5\right)\right]+\left[\left(-14\right)+\left(-16\right)\right]\)

\(=10+\left(-30\right)\)

\(=-20\)

9) \(\left(-20\right)+\left(-14\right)+3+\left(-86\right)\)

\(=\left[\left(-20\right)+3\right]+\left[\left(-14\right)+\left(-86\right)\right]\)

\(=\left(-17\right)+\left(-100\right)\)

\(=-117\)

10) \(\left(-136\right)+123+\left(-264\right)+\left(-83\right)+240\)

\(=\left[\left(-136\right)+\left(-264\right)\right]+\left[123+\left(-83\right)\right]+240\)

\(=\left(-400\right)+40+240\)

\(=\left(-360\right)+240\)

\(=-120\)

11) \(\left(-596\right)+2001+1999+\left(-404+189\right)\)

\(=\left(-596\right)+2001+1999-404+189\)

\(=\left[\left(-596\right)-404\right]+\left(2001+189\right)+1999\)

\(=\left(-1000\right)+2190+1999\)

\(=1190+1999\)

\(=3189\)

12) \(314+\left(-153\right)+64+121+\left(-247\right)+218\)

\(=\left(314+64+121\right)+\left[\left(-153\right)+\left(-247\right)\right]+218\)

\(=\left(378+121\right)+\left(-400\right)+218\)

\(=499-400+218\)

\(=99+218\)

\(=317\)

\(\text{#}Toru\)

a: 200<314

=>1/200>1/314

=>17/200>17/314

b: 11/54=22/108

37<108

=>22/37>22/108

=>22/37>11/54

c: 141/893=3/19

159/901=3/17

mà 3/19<3/17

nên 141/893<159/901

d: 9/382=18/764=90/3820

6/257=18/771=90/3855

15/643=90/3858

3820<3855<3858

=>90/3820>90/3855>90/3858

=>9/382>6/257>15/643

a: 200<314

=>1/200>1/314

=>17/200>17/314

b: 11/54=22/108

37<108

=>22/37>22/108

=>22/37>11/54

c: 141/893=3/19

159/901=3/17

mà 3/19<3/17

nên 141/893<159/901

d: 9/382=18/764=90/3820

6/257=18/771=90/3855

15/643=90/3858

3820<3855<3858

=>90/3820>90/3855>90/3858

=>9/382>6/257>15/643

a ) 4 7 + 2 7 + 1 7 + 3 4 + 5 4 = 3 b ) − 5 7 + − 2 7 + − 1 5 + 3 4 + 1 4 = − 1 5

c ) 5 13 + 8 13 + − 5 7 + − 20 41 + − 21 41 = − 5 7 d ) 1 28 + 3 28 + 3 14 + − 1 14 + − 1 7 = 1 7 e ) 1 2 + − 1 2 + − 2 3 + 2 3 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0

`#040911`

`a)`

\(37 \times 7 - 17 \times 11 + 13 \times 37 + 17 \times 21\)

`= 37 \times (7 + 13) + 17 \times (21 - 11)`

`= 37 \times 20 + 17 \times 10`

`= 10 \times (37 \times 2 + 17)`

`= 10 \times 91`

`= 910`

`b)`

\(5^5 \times 5^2 \div 5^4 - 2^8 \div 2^4\)

`=`\(5^{5+2-4}-2^{8-4}\)

`= 5^3 - 2^4`

`= 125 - 16`

`= 109`

`c)`

\(3^{11}\times12+3^{12}\times5-3^{14}\)

`=`\(3^{11}\times\left(12+3\times5-3^3\right)\)

`=`\(3^{11}\times\left(12+15-27\right)\)

`=`\(3^{11}\times0=0\)

a) = 259 - 187 + 481 + 357

= 910

b) = 5⁷ : 5⁴ - 2⁴

= 5³ - 2⁴ 

= 125 - 16

= 109

Bài 2:

a, 37 x 7 - 17 x 11 + 13 x 37 + 17 x 21

= ( 37 x 7 + 13 x 37) + ( 17 x 21 - 17 x 11)

= 37 x ( 7 + 13) + 17 x ( 21 - 11)

= 37 x 20 + 17 x 10

= 740 + 170

= 910 

b, 5⁵ x 5² : 5⁴ - 2⁸ : 2⁴

= 5⁷: 5⁴ - 2⁴

= 5³ - 16

= 125 - 16

= 109

c, 3¹¹ x 12 + 3¹² x 5 - 3¹⁴

  3¹¹ x ( 12 + 3 x 5 - 13³)

= 3¹¹ x ( 12 + 15 - 3³)

= 3¹¹ x ( 27 - 27)

 = 3¹¹ x 0

= 0 

Ta có : \(A=\frac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right)^2}\)

\(\Rightarrow\)  \(A=\frac{11.3^{22+7}-\left(3^2\right)^{15}}{2^2.\left(3^{14}\right)^2}\)

\(\Rightarrow\)  \(A=\frac{11.3^{29}-3^{30}}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=\frac{3^{29}.\left(11-3\right)}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=\frac{3^{29}.8}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=\frac{3^{29}.2^3}{2^2.3^{28}}\)

\(\Rightarrow\)  \(A=3.2\)

\(\Rightarrow\)  \(A=6\)

   Vậy A = 6

                ♥...♥...♥  Chúc bn họk tốt  ♥...♥...♥

a,  15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0

= 15.{32:[1+15]+3}–1

= 15.5–1

= 74

b,  25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }

= 25.{128:[8+4.2]–16}

= 25.24

= 600

c,  2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }

= 2019.{101–1000:[(32+125–36):11–1]}

= 2019.{101–1000:[121:11–1]}

= 2019.{101–1000:10}

= 2019.1

= 2019