98.42 - 50[(18 - 2mũ3) : 2 + 3mũ2 ]

= 98.42 - 50[(18 - 8) : 2 + 9]

= 98.42 - 50[10 : 2 + 9]

= 98.42 - 50[ 5 + 9 ]

= 98.42 - 50.14

=  28812.100

=  2881200

-167.58

\(4116-50\left[11:2+9\right]\)

\(4116-50\left[5,5+9\right]\)

\(4116-50.14,5\)

\(4116-735\)

\(3381\)

\(98.42-50\left[\left(18-2^3\right):2+3^2\right]\\ =4116-50\left[\left(18-8\right):2+9\right]\\ =4116-50\left[10:2+9\right]\\ =4116-50\left[5+9\right]\\ =4116-50.14\\ =4116-700\\ =3416\)

98.42-50.[(18-2³):2 +3²]

=98.42-50.[(18-8):2+3²]

=98.42-50.[10:2+3]

=98.42-50.[5+3]

=98.42-50.8

= 4116-400

=3716

=98*42-50*[(18-8):2+9]

=98*42-50*14

=3416

n: =345:(-345)=-1

n, (-15) x (-23) : (-345)

=   345  : (-345)

= -1

o, 36.55 - 185.11 + 121.5

 = 36.11.5 - 5.11.37 + 11.11.5

= 11.5.(36- 37 + 11)

= 11.5.10

= 550

mn bày e gấp vs ạ,e đag cần gấp lắm

ôi bạn ơi

mik ko bt

a. 800-{50.[18-2³) : 2 + 3²]}

= 800 - {50.[18 - 8) : 2 + 9]}

= 800 - {50.[10 : 2 + 9]}

= 800 - [50.(5 +9)]

= 800 - (50 . 14)

= 700

= 100

b. 28.(231+69) + 72.(131+169)

= 28.300 + 72.300

= 300 . (28 + 72)

= 300 . 100

= 30000

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 \(n\in\left\{0;1;4;9\right\}\)

Giải:

\(A=\left[\left(-8\right)+\left(-7\right)\right]+\left(-10\right)=\left(-15\right)+\left(-10\right)=\left(-25\right)\) 

\(B=-\left(-299\right)+\left(-219\right)+\left(-401\right)+12=299-219-401+12=-309\) 

\(C=555+\left(-100\right)+\left(-80\right)+\left|-333\right|=555-100-80+333=708\) 

\(D=\left|-347\right|+\left(-40\right)+3150+\left(-307\right)=347-40+3150-307=2456\) 

\(E=98.42-\left\{50.\left[\left(18-2^3\right):2+3^2\right]\right\}\) 

\(E=4116-\left\{50.\left[\left(18-8\right):2+9\right]\right\}\) 

\(E=4116-\left\{50.\left[10:2+9\right]\right\}\)

\(E=4116-\left\{50.\left[5+9\right]\right\}\) 

\(E=4116-\left\{50.14\right\}\) 

\(E=4116-700\) 

\(E=3416\) 

\(F=-80-\left[-130-\left(12-4^2\right)\right]+2008^0\) 

\(F=-80-\left[-130-\left(12-16\right)\right]+1\) 

\(F=-80-\left[-130-\left(-4\right)\right]+1\) 

\(F=-80-\left(-126\right)+1\) 

\(F=47\) 

\(G=1000+\left(-670\right)+297+\left(-330\right)=1000-670+297-330=297\) 

\(H=1024:2^4+140:\left(38+2^5\right)-7^{23}:7^{21}\) 

\(H=2^{10}:2^4+140:\left(38+32\right)-7^2\) 

\(H=2^6+140:70-49\) 

\(H=64+2-49\) 

\(H=17\) 

\(I=\left|-129\right|-119+\left|2-31\right|=129-119+\left|-29\right|=10+29=39\) 

\(K=219+573+381-173\) 

\(K=\left(219+381\right)+\left(573-173\right)\)

\(K=600+400\) 

\(K=1000\)

\(L=36.33-105.11+22.15\) 

\(L=36.33-35.3.11+11.2.3.5\) 

\(L=36.33-35.33+33.10\) 

\(L=33.\left(36-35+10\right)\) 

\(L=33.11\) 

\(L=363\) 

\(N=160-\left(2^3.5^2-6.25\right)\) 

\(N=160-\left[25.\left(8-6\right)\right]\) 

\(N=160-\left[25.2\right]\) 

\(N=160-50\) 

\(N=110\) 

\(O=\left(44.52.60\right):\left(11.13.15\right)=137280:2145=64\) 

\(P=\left(2^{17}+15^4\right).\left(3^9-2^{17}\right).\left(2^4-4^2\right)=\left(2^{17}+15^4\right).\left(3^9-2^{17}\right).0=0\)  

\(Q=100+98+96+...+4+2-97-95-...-3-1\) 

\(Q=100+\left(98-97\right)+\left(96-95\right)+...+\left(4-3\right)+\left(2-1\right)\) 

\(Q=100+1+1+...+1+1\) 

Vì có 98:2=49 số 1

\(\Rightarrow Q=100+49\) 

\(Q=149\)

a) 58.57+58.150-58.125   

=58.(57+150-125)

=58.    82

=    4756        

b)3².5-2².7+83.2019⁰

=9.5-4.7+83

=45-28+83

=100

c)2019+(-247)+(-53)-2019 

 =(2019-2019)+[ (-247)+(-53)]

0+(-300)

= -300             

d)13.70-50 [(19-3²):2+2³]

=13.70-50[10:2+8]

=13.70-50.13

=13.(70-50)

=13.20

=260

2.

a)x-36:18=12-5   

    x-36:18=6

    x-36=6.18   

     x-36=108

      x=108+36

      x=    144                    

b)92-(17+x)=72

17+x=92-72

17+x=20

x=20-17

x=3

c)720:[41-(2x+5)]=40     

41-(2x+5)=720:40

41-(2x+5)=  18

2x+5=41-18

2x+5=23

2x=23-5

2x=18

x=18:2

x=9                 

d) (x+2)³ -23=41

 (x+2)³ =41+23

 (x+2)³ =64

=> (x+2)³ =4³

=>x+2=4

=>x=4-2

=>x=2

câu nầy hơn khó nên mình ko giải đc bạn đợ mình giải đã

1) 2763 + 152 = 2951

2)(-7) + (-14) = -21

3)(-35) + (-9) =-44

4) (-5) + (-248) = -253