4.120+[45:9+15(x+1)]=500

=>480+[5+15(x+1)]=500

=>5+15(x+1)=20

=>15(x+1)=15

=>x+1=1

=>x=0

4.120+[45:9+15(x+1)]=500

480+[5+15x+15]=500

480+5+15x+15=500

500+15x=500

15x=0

x=0

a: \(\Leftrightarrow5x-42=251\)

=>5x=293

hay x=293/5

b: \(\Leftrightarrow20-x=20\)

hay x=0

c: \(\Leftrightarrow x-4300-\dfrac{1}{50}=4250\)

\(\Leftrightarrow x=\dfrac{427501}{50}\)

d: =>(x+200):4=460-340=120

=>x+200=480

hay x=280

e: =>5+15(x+1)=500-480=20

=>15(x+1)=15

=>x+1=1

hay x=0

4 . 120 + [45 : 9 +15 . (x + 1) = 500

480 + [45 : 9 +15 . (x + 1) = 500

45 : 9 +15 . (x + 1) = 500-480

45 : 9 +15 . (x + 1) = 20

5 +15 . (x + 1) = 20

15 . (x + 1) = 20-5

15 . (x + 1) = 15

x + 1=15:15

x + 1=1

x=1-1

x=0

= 0

tick cho mink nha

=>480 + [ 5 + 15 . (x + 1) = 500

15 . ( x + 1 )=500 - 480 - 5 = 15

x + 1 =15 : 15 =1

x =1 - 1

x = 0

vay x =0

k nha

1

Theo đề bài ta có:

x chia hết cho 15

x chia hết cho 180

=>x=BC(15,180)

15=3.5

180=2².3².5

BCNN(15,180)=2².3².5=4.9.5=180

BC(15,180)=B(180)={0;180;360;540;...}

=>x thuộc {0;180;360;540;...}

Bài này hok khó lắm đâu,chịu suy nghĩ 1 lát là làm đc ấy mà

1 .x=2700

2.{1;5}