a,4.5²-3.2+ 3³ :  3²= 4* 5^2 - 3*(2+1)= 100 - 9 = 91 

b,150: [25.( 18-4² )= 150 : (25 * 2) = 3

c,S=1+3+5....99

= (1+99) +(3+ 97) +....+ (47 + 53) + (49 + 51) 

= 100 * 25 

= 2500

d,125+70+375+230= (125+ 375) +(70 + 230) = 500 + 300 = 800

e,315-64:2³ = 135 -8 = 127 

f,6x-5=31

6x = 36

x=6    

g,2.14.(x-5)=28

28 (x-5) = 28

x-5 =1

x=6  

a,4.5²-3.2+3³:  3²=97

b,150: [25.( 18-4² )=3

c,s=1+3+5....99=2500

d,125+70+375+230=800

e,315-64:2³=307

f,6x-5=31=>x=6

g,2.14.(x-5)=28=>x=6

cik cho mik nha bn!

dm bon giai toan tren mang

a, mk làm kết quả lun.

=12:{400:[500-(125+175)]}

=12:{400:[500-300]}

=12:{400:200}

=12:2

=6

b,

=110-18:3

= 110-6

=104

k mk nha. k xong mk làm tiếp. dài quá nhưng cx dễ

a,18³:9³=(18-9)³=729

b,còn lại tự làm ,làm mẫu đến đây thôi

l.i.k.e cho mình nha Nguyen vu dang nguyen

18³: 9³=8

C) 213

D)0

575-[6x+60]=25

       [6x+60]=575-25

       [6x+60]=550

suy ra:

6x+60=550          hoặc          6x+60=-550

6x       =550-60                      6x      =-550-60

6x        =490                           6x     =-610

vậy...

[x+32]-17.2=42

[x+32]-17   =42:2

[x+32]-17   =21

[x+32]         =21+17

[x+32]         =28

suy ra:       

x+32=28            hoặc            x+32=-28

x      =28-32                           x      =-28-32

x      =-4                                x       =-60

315+[125-x]=435

        [125-x]=435-315

        [125-x]=120

suy ra:

125-x=120          hoặc          125-x=-120

       x=125-120                            x=125-(-120)

       x=5                                       x=245

vậy...

300

300

= 300 

1.

a) \(125+80+375+220\)

\(=\left(125+375\right)+\left(80+220\right)\)

\(=500+300\)

\(=800\)

b) \(25.11.8.4.125\)

\(=\left(25.4\right).\left(8.125\right).11\)

\(=100.1000.11\)

\(=1100000\)

c) \(18.74+18.27-18\)

\(=18.\left(74+27-1\right)\)

\(=18.100\)

\(=1800\)

d) \(75.23+75.77-500\)

\(=75.\left(23+77\right)-500\)

\(=75.100-500\)

\(=7500-500\)

\(=7000\)

e) \(150:\left[25.\left(18-4^2\right)\right]\)

\(=150:\left[25.\left(18-16\right)\right]\)

\(=150:\left[25.2\right]\)

\(=150:50\)

\(=3\)

f) \(125.23.2.8.50\)

\(=\left(125.8\right).\left(2.50\right).23\)

\(=1000.100.23\)

\(=2300000\)

g) \(235+88+165+12\)

\(=\left(235+165\right)+\left(88+12\right)\)

\(=400+100\)

\(=500\)

h) \(71.32+71.68-1100\)

\(=71.\left(32+68\right)-1100\)

\(=71.100-1100\)

\(=7100-1100\)

\(=6000\)

i) \(6^7:6^6+4^3.2-24^0\)

\(=6+64.2-1\)

\(=6+128-1\)

\(=133\)

j) \(546-6.\left[158:\left(30+7^2\right)\right]\)

\(=546-6.\left[158:\left(30+49\right)\right]\)

\(=546-6.\left[158:79\right]\)

\(=546-6.2\)

\(=546-12\)

\(=534\)

k) \(268+147+132+253\)

\(=\left(268+132\right)+\left(147+253\right)\)

\(=400+400\)

\(=800\)

2. 

a) \(7x=707\)

\(x=707:7\)

\(x=101\)

b) \(6x+5=47\)

\(6x=47-5\)

\(6x=42\)

\(x=42:6\)

\(x=7\)

c) \(35:\left(x+1\right)=7\)

\(x+1=35:7\)

\(x+1=5\)

\(x=5-1\)

\(x=4\)

d) \(12+\left(29-3x\right)=35\)

\(29-3x=35-12\)

\(29-3x=23\)

\(3x=29-23\)

\(3x=6\)

\(x=6:3\)

\(x=2\)

e) \(2.4^x+10^1=138\)

\(2.4^x=138-10\)

\(2.4^x=128\)

\(4^x=128:2\)

\(4^x=64=4^3\)

\(\Rightarrow x=3\)

f) \(7x=140\)

\(x=140:7\)

\(x=20\)

g) \(7\left(15-x\right)+14=84\)

\(7\left(15-x\right)=84-14\)

\(7\left(15-x\right)=70\)

\(15-x=70:7\)

\(15-x=10\)

\(x=15-10\)

\(x=5\)

h) \(3^x.5-15=390\)

\(3^x.5=390+15\)

\(3^x.5=405\)

\(3^x=405:5\)

\(3^x=81=3^4\)

\(\Rightarrow x=4\)

3.

Ta có:

\(\Rightarrow n+11⋮n+1\)

\(\Rightarrow n+1+10⋮n+1\)

\(\Rightarrow10⋮n+1\) hay \(n+1\inƯ\left(10\right)=\left\{-10;-5;-2;-1;1;2;5;10\right\}\)

\(\Rightarrow\) \(n\in\left\{-11;-6;-3;-2;0;1;4;9\right\}\)

Vì \(n\in N\) nên \(n\in\left\{0;1;4;9\right\}\)

a) 12 : { 400 : [500 – (125 + 25 . 7)]} 

=12 : { 400 : [500 – (125 + 175)]} 

=12 : [ 400 : [500 – 300)]

=12 : (400:200)

=12:2=6

b) 5 . 2² – 18 : 3

=5.4-6

=20-6=14

c) 18 : 3 + 182 + 3.(51 : 17)

=5+182+3.3

=187+9=196

d) 25 . 8 – 12.5 + 170 : 17 – 8

=200-60+10-8

=142

e) 2.5²+ 3: 71⁰ – 54: 3³ 

=2.25+3:1-54:27

=50+3-2

=51

f) 189 + 73 + 211 + 127

=(189+211)+(73+127)
=400+200=600

g) 375 : {32 – [ 4 + (5. 32– 42)]} – 14 )

 =375 : {32 – [ 4 + (160– 42)]} – 14 )

 =375 : [32 – ( 4 + 118) – 14 ]

=375:(32-122-14)

=375:-104

=-375/104

h) (5²⁰²² + 5²⁰²¹) : 5²⁰²¹

=(5²⁰²²:5²⁰²¹)+(5²⁰²¹:5²⁰²¹)

=5+1=6

Bài 1: Thực hiện các phép tính sau:

\(a)\)Chưa rỏ đề

\(b)\)\(5025\div5-25\div5\)

\(=\)\(1005-5\)

\(=\)\(1000\)

\(c)\)\(218-180\div2\div9\)

\(=\)\(218-10\)

\(=\)\(208\)

\(d)\)\(\left(328-8\right)\div32\)

\(=\)\(320\div32\)

\(=\)\(10\)

Bài 1:

a) ( Tôi không nhìn rõ đầu bài )

b) 5025  :  5  -  25  :  5

=  ( 5025  -  25 )  :  5

=        5000   :   5

=       1000

c)   218  -  180  :  2  :  9

=     218   -    180  :  (  2  .  9 )

=      218    -    180   :  18

=       218    -    10

=       208

d)   (  328  -  8  )  :  32

=      320   :   32

=     10 

Bài 2: Thực hiện phép tính:

\(a)\)\(27.75+25.27-150\)

\(=\)\(27.\left(75+25\right)-150\)

\(=\)\(27.100-150\)

\(=\)\(2700-150\)

\(=\)\(2550\)

\(b)\)\(12\div\left\{400\div\left[500-\left(125+25.7\right)\right]\right\}\)

\(=\)\(12\div\left\{400\div\left[500-\left(125+175\right)\right]\right\}\)

\(=\)\(12\div\left\{400\div\left[500-300\right]\right\}\)

\(=\)\(12\div\left\{400\div200\right\}\)

\(=\)\(12\div2\)

\(=\)\(6\)

\(c)\)\(13.17-256\div16+14\div7-1\)

\(=\)\(221-16+2-1\)

\(=\)\(206\)

\(d)\)\(18\div3+182+3.\left(51\div17\right)\)

\(=\)\(6+182+3.3\)

\(=\)\(6+182+9\)

\(=\)\(197\)