https://hoc24.vn/cau-hoi/a-5x-2x-62-50b-5x-x-150-2-3c-6x-x-511-59-31d-5x-3x-36-334-124x-2x-68-219-216.2785429565572

a: \(\Leftrightarrow7x=35\)

hay x=5

b: \(\Leftrightarrow6x=78\)

hay x=13

a.75-(3.5^2-4.2^3)

=75-(-5)

=80

b.-/-12/+12-(-24)

= - 12 + 12 - 24

=0-24

=-24

c.17.85+15.17-120

=17.(85+15)-120

=17.100-120

=1700-120

=1580

bài 2: tìm x

a. 70-5.(x-3)=45

5.(x-3)=70-45=25

x-3=25:5=5

x=5+3=8

vậy x=8

Bài 2:a)<=>5(x+4) =125-38

<=>5(x+4)=87

<=>x+4=17,4

<=>x=17,4-4=13.4

b)<=> ( 3x – 2⁴) . 7³ = 2.7⁴

<=> (3x – 16) = 2.7⁴ : 7³

<=> (3x – 16) =2.7

<=>3x – 16 = 14

<=> 3x = 30

<=> x = 10

c)=> xϵ​
ƯC (70, 84) và x > 8
Ta có: 70 = 2. 5. 7 => ƯCLN( 70,84) = 2. 7 = 14
84 = 22. 3. 7
=> ƯC (70, 84) = Ư(14) = { 1 ;2; 7; 14 }
Vì x > 8 => x = 14

d)=>xϵ​
BCNN (12, 25, 30) và 0 < x < 500


=>BC(12,25,30)=B(300) = { 0; 300; 600; …}
Vì 0 < x < 500
=> x = 300

giup minh nha cac ban . lam duoc minh se tick cho va ket ban . cam on cac ban

minh lay cac ban day

ta có 5^x+5^x*25=650 suy ra 5^x *26=650 ,5^x=25 suy ra x=2

Mk giúp phần đầu nhé!

Có 5^x+5^x+2=650

=> 5^x.(1+5²)=650

     5^x. 26=650

     5^x=650:26

     5^x=25

=> x=2

12*34=1*68

=>12*34-6*68=0=>bieu thuc = 0

a. 59 + 296

= ( 59 + 1 ) + 295 

= 60 + 295 

= 355 

b) 592 + 48

= ( 592 + 8 ) + 40 

= 600 + 40 
= 640 

Các câu sau tương tự

bạn  giải hộ mk hết bài 1 đi xin bạn đó

mk giải típ cho nè

d)277+113+323+87                      

=(277+113)+(323+87)

=  390       +   410

= (390+10)+400

=   400     +400

=    800

\(a.\)

\(\left(x^2-25\right):\dfrac{2x+10}{3x-7}\)

\(=\left(x-5\right)\left(x+5\right).\dfrac{3x-7}{2\left(x+5\right)}\)

\(=\dfrac{\left(x-5\right)\left(x+5\right)\left(3x-7\right)}{2\left(x+5\right)}\)

\(=\dfrac{\left(x-5\right)\left(3x-7\right)}{2}\)

\(b.\)

\(\dfrac{x^2+x}{5x^2-10x+5}:\dfrac{3x+3}{5x-5}\)

\(=\dfrac{x\left(x+1\right)}{5\left(x^2-2x+1\right)}.\dfrac{5\left(x-1\right)}{3\left(x+3\right)}\)

\(=\dfrac{x\left(x+1\right)}{5\left(x-1\right)^2}.\dfrac{5\left(x-1\right)}{3\left(x+1\right)}\)

\(=\dfrac{x\left(x+1\right).5\left(x-1\right)}{5\left(x-1\right)^2.3\left(x+1\right)}\)

\(=\dfrac{x}{3\left(x-1\right)}\)

\(\dfrac{x^2+x}{5x^2-10x+5}:\dfrac{3x+3}{5x-5}=\dfrac{5x\left(x+1\right)\left(x-1\right)}{15\left(x-1\right)^2\left(x+1\right)}=\dfrac{x}{3\left(x-1\right)}\)\(\left(x^2-25\right):\dfrac{2x+10}{3x-7}=\dfrac{\left(x-5\right)\left(x+5\right)\left(3x-7\right)}{2\left(x+5\right)}=\dfrac{\left(x-5\right)\left(3x-7\right)}{2}\)

516 x 2,15=1109,4

2,1655:50,4331

...

a, 516 x 2,15 = 1109,4

b, 2,1655 : 5 = 0,4331

c, \(\frac{15}{4}\)x \(\frac{8}{3}\)x \(\frac{16}{25}\)x \(\frac{1}{5}\)

= 10 x \(\frac{16}{25}x\frac{1}{5}\)

= \(\frac{32}{5}x\frac{1}{5}\)

= \(\frac{32}{25}\)

d, \(\frac{3}{7}:\frac{5}{4}x\frac{3}{5}\)

= \(\frac{3}{7}x\frac{4}{5}x\frac{3}{5}\)

= \(\frac{12}{35}x\frac{3}{5}\)

= \(\frac{36}{175}\)

a, 516x2,15=1109,4

b, 2,1655 : 5=0,4331

c, 15/4 x 8/3 x 16/25 x 1/5

=10x16/25 x 1/5

=6,4x1/5

=1.28

d, 3/7 : 5/4 x 3/5=12/35x3/5=36/175