a) x = 160

b) x = 5

c) x = 107

d) x = 3

a, \(6^2:4.3+2.5^2=36:4.3+2.25\)'

\(=9.3+50=27+50=77\)

b, \(2\left(5.4^2-18\right)=2\left(5.16-18\right)\)

\(=2.5.16-2.18=10.16-36\)

\(=160-36=124\)

c, \(5.4^2-18:3^2=5.4.4-18:3^2\)

\(=20.4-18:9=80-2=78\)

\(a,6^2:4.3+2.5^2\)

\(=9.3+2.25\)

\(=27+50\)

\(=77\)

\(b,2.\left(5.4^2-18\right)\)

\(=2.\left(80-18\right)\)

\(=2.62\)

\(=124\)

\(c,5.4^2-18:3^2\)

\(=5.16-18:9\)

\(=80-2\)

\(=78\)

\(d,3^3.18-3^3.12\)

\(=3^3.6.3-3^3.6.2\)

\(=3^3.6.\left(3-2\right)\)

\(=27.6.1\)

\(=162\)

\(e,39.213+84.39\)

\(=39.\left(213+84\right)\)

\(=39.297\)

\(=11583\)

\(j,80-\left[130-\left(12-4\right)^2\right]\)

\(=80-\left[130-8^2\right]\)

\(=80-66\)

\(=14\)

Học tốt

d, \(3^3.18-3^3.12\)

\(=3^3.\left(18-12\right)=9.3.6\)

\(=27.6=162\)

e, \(39.213+84.39\)

\(=39\left(213+84\right)\)

\(=39.297=11583\)

j, \(80-\left[130-\left(12-4\right)^2\right]\)

\(=80-\left[130-8^2\right]\)

\(=80-\left(130-64\right)\)

\(=80-66=14\)

5^x.5^x+1.5^x+2\(\le\)100...0:2¹⁸ =>100...0:2¹⁸=5¹⁸.2¹⁸:2¹⁸=5¹⁸

5^x.5^x+1.5^x+2=>x+x+1+x+2=5¹⁸

3x+3=18

 3x  =18-3

 3x  =15

 x    =15:3

 x    =5

vậy x =5

102.18:[(5x+130):x]=100

1800:((5x

=>100.18:[(5x+130):x]=100

=>1800:[(5x+130):x]=100

=>(5x+130):x=1800:100=18

=>5x:x+130:x=18

=>\(\frac{5x}{x}+\frac{130}{x}=18=>\frac{5x+130}{x}=18=>5x+130=18x=>18x-5x=130\)

=>13x=130=>x=10

130( 36+24+40)= 130.100=130 00

tick đi bạn

a: Đặt A=2+4+...+82+84
Số số hạng là (84-2):2+1=42(số)

Tổng là (84+2)*42/2=1806

Đặt B=4+7+...+130+133

Số số hạng là (133-4):3+1=44(số)

Tổng là (133+4)*44/2=3014

=>C=1806/3014=903/1507

b: \(=\dfrac{18\left(123+4567+5310\right)}{132+48}=\dfrac{18\cdot10000}{180}=1000\)

11- (x+84) = 97 

=> 11 -x - 84 = 97 

=> 11-x = 181

=> x= 11- 181 

=> x= -170

cấc câu sau làm tương tự

11 - (x + 84) = 97

x + 84 = 11 - 97

x + 84 = -86

x = -86 - 84

x = -170

-(x + 84) + 213 = -16

-x - 84 = -16 - 213

-x - 84 = -229

-x = -229 + 84

-x = -145

x = 145

x + (-35) = 18

x - 35 = 18

x = 18 + 35

x = 53

-2x -(-17)= 15

-2x + 17 = 15

-2x = 15 - 17

-2x = -2

x = -2 : (-2)

x =1

a,11-(x+84)=97

11-x-84   =97

11-x         =97+84

11-x         =181

x              =11-181

x              =-170

b,-(x+84)+213=-16

-x-84+213   =-16

-x-84           =-16-213

-x-84           =-229

-x                 =-229+84

-x                 =-145

x                  =145

c,x+(-35)=18

x-35    =18

x         =18+35

x         =53

d,-2x-(-17)=15

-2x+17      =15

-2x            =15-17

-2x            =-2

-x              =-2:2

-x              =-1

x               =1

1:  9 - 25 - (7 - x) - (25 + 7)

đề thiếu

2:  -6 . x = 18

x=18:(-6)

x=-3

3:  [(6 . x - 72) : 2- 84]. 28= 5628

(6.x-72):2-84=5628:28

(6.x-72):2-84=201

(6.x-72):2=201+84

(6.x-72):2=285

6.x-72=285.2

6.x-72=570

6.x=570+72

6.x=642

x=642:6

x=107