1.-121-(35-x)=50 2.x+(-3)=-51+44 3.11-(-27+x)=31 4.(-x+7)-4=-10-20 5.15+[24-(4+x)]=-35 6.-(x+12)-33=-50 7.2130-(x+130)+72=-64

2 bình luận về “1.-121-(35-x)=50 2.x+(-3)=-51+44 3.11-(-27+x)=31 4.(-x+7)-4=-10-20 5.15+[24-(4+x)]=-35 6.-(x+12)-33=-50 7.2130-(x+130)+72=-64”

1. $\text{1) (-121) -(35-x)=50 }$

   $\text{⇒ x -35 = 50 + 121}$

   $\text{⇒ x -35 = 171}$

   $\text{⇒ x = 171 + 35}$

   $\text{⇒ x = 206}$

   $\text{Vậy : x = 206}$

   $\text{2) x+(-3) =- 51+44}$

   $\text{⇒ x -3 =-7}$

   $\text{⇒ x = -7 +3}$

   $\text{⇒ x= -4}$

   $\text{Vậy ; x= -4}$

   $\text{3) 11-(-27+x)=31}$

   $\text{⇒ x – 27 = 31 -11}$

   $\text{⇒ x = 31 – 11 +27}$

   $\text{⇒ x = 47}$

   $\text{Vậy : x = 47}$

   $\text{4) (-x+7)-4=-10-20}$

   $\text{⇒ 7 – x = – 10 – 20 + 4}$

   $\text{⇒ 7 – x = -26}$

   $\text{⇒ -x = -26 -7}$

   $\text{⇒ x = 33}$

   $\text{Vậy : x= 33}$

   $\text{5) 15+[24-(4+x)]=-35}$

   $\text{⇒ 15+( 24 – 4 – x) = -35}$

   $\text{⇒ 15 + 20 -x = -35}$

   $\text{⇒ – x = – 35 – 15 – 20}$

   $\text{⇒ x = 70}$

   $\text{Vậy : x =70}$

   $\text{6) -(x+12)-33=-50}$

   $\text{⇒ – x -12 – 33 = -50}$

   $\text{⇒ -x = -50 + 12 + 33

   $\text{⇒ -x = -5}$

   $\text{⇒ x = 5}$

   $\text{Vậy : x= 5}$

   $\text{7) 2130-(x+130)+72= -64}$

   $\text{⇒ 2130 – x – 130 + 72 = -64}$

   $\text{⇒ – x =-64 – 2130 + 130 – 72}$

   $\text{⇒ -x = – 2136}$

   $\text{⇒ x = 2136}$

   $\text{Vậy : x= 2136}$

   Trả lời
2. Giải đáp:

    1)

   (-121)-(35-x)=50

   => 35-x=(-121)-50

   => 35-x=-171

   => x=35-(-171)

   => x=35+171

   => x=206

   Vậy x=206

   2)

   x+(-3)=-51+44

   =>x-3=44-51

   => x-3=-7

   => x=-7+3

   => x=-4

   Vậy x=-4

   3)

   11-(-27+x)=31

   => -27+x=11-31

   => -27+x=-20

   => x=(-20)-(-27)

   => x=(-20)+27

   => x=27-20

   => x=7

   Vậy x=7

   4)

   (-x+7)-4=-10-20

   => (7-x)-4=-30

   => 7-x=-30+4

   => 7-x=-26

   => x=7-(-26)

   => x=7+26

   => x=33

   Vậy x=33

   5)

   15+[24-(4+x)]=-35

   => 24-(4+x)=(-35)-15

   => 24-(4+x)=-50

   => 4+x=24-(-50)

   =>4+x=24+50

   => 4+x=74

   => x=74-4

   => x=70

   Vậy x=70

   6)

   -(x+12)-33=(-50)

   => -(x+12)=(-50)+33

   => (-1).(x+12)=-17

   => x+12=(-17):(-1)

   => x+12=17

   => x=17-12

   => x=5

   Vậy x=5

   7)

   2130-(x+130)+72=-64

   => 2130-x-130+72=-64

   => -x+(2130-130+72)=-64

   => -x+2072=-64

   => -x=-64-2072

   => -x=-2136

   => x=2136

   Vậy x=2136

    

   Trả lời