=1x0.5:X+0.4:X = 18+0.3:X

=0.5:X+0.4:X = 18+0.3:X

=(0.5+0.4):X = 18+0.3:X

=0.9:X = 18+0.3:X

18=(0.9-0.3):X

18=0.6:X

X=18:0.6

X=30

190

190

190

    100%x-50%:x+40%:x=18+30%:x

<=>x-x/2+2/5x=18+3/10x

<=>10x²-5x²+4=180x+3

<=>10x²-5x²+4-180x-3

<=>5x²-180x+1=0

Denta=(-180)²-4.5.1=32380

Phương trình có 2 nghiệm phân biệt :

x¹=180+căn32380/10;x²=180-căn32380/10

12+13=35-10

40+50=100-10

12+13 =35 - x

25      = 35 - x

x        = 35 - 25

x       =10

40 + 50 = 100 -x

90         = 100 - x

x           =100-90

x          =10

12 + 13 = 35 - x

25         = 35 - x

x           = 35 - 25

x           = 10

40 + 50 = 100 - x

90         = 100 - x

x           = 100 - 90

x           = 10

100%:x-50%:x+40%:x=18+30%:x

<=> (100% - 50% + 40%) : x = 18 + 30% : x

<=> 90% : x = 18 + 30% : x 

=> 90% : x - 30% : x = 18

=> (90% - 30%) : x = 18

<=> x = 60% : 18

=> x = \(\frac{1}{30}\)

100%:x-50%:x+40%:x=18+30%:x

<=> (100% - 50% + 40%) : x = 18 + 30% : x

<=> 90% : x = 18 + 30% : x 

=> 90% : x - 30% : x = 18

=> (90% - 30%) : x = 18

<=> x = 60% : 18

=> x = 1/30

Học tốt nha! Love❤

Cảm ơn nhà Mik tick rồi

|50-x|=40

=>50-x=40                  hoặc              50-x=-40

         x=50-40                                        x=50-(-40)

         x=10                                             x=90

|100-x+5|=-7

vô lí

tìm x biết 

100% : x - 50% : x + 40 % : x = 18 + 30% 

1 : x - 0.5 + 0.4 : x = 18 + 0.3

( 1 - 0.5 + 0.4 ) : x = 17.7

0.9 : x = 17.7

       x = 0.9 : 17.7

      x = \(\frac{3}{59}\)