Question

Tìm x :

12 + 13 = 35 - x

40 + 50 = 100 - x

Answer 1

12+13=35-10

40+50=100-10

Answer 2

12+13 =35 - x

25      = 35 - x

x        = 35 - 25

x       =10

40 + 50 = 100 -x

90         = 100 - x

x           =100-90

x          =10

Answer 3

12 + 13 = 35 - x

25         = 35 - x

x           = 35 - 25

x           = 10

40 + 50 = 100 - x

90         = 100 - x

x           = 100 - 90

x           = 10

Answer 4

\(12+13=35-x\)

\(35-\left(12+13\right)\)

\(x=10\)

\(40+50=100-x\)

\(100-\left(40+50\right)\)

\(x=10\)

Answer 5

\(12+13=35-x\)

\(\Rightarrow25=35-x\)

\(\Rightarrow x=10\)

\(40+50=100-x\)

\(\Rightarrow90=100-x\)

\(\Rightarrow x=10\)

Answer 6

12 + 13 = 35 - x

25 = 35 - x

=> x = 35 - 25

=> x = 10

40 + 50 = 100 - x

90 = 100 - x

=> x = 100 - 90

=> x = 10 

Answer 7

\(12+13=35-x\)

\(25=35-x\)

\(\Rightarrow x=10\)

\(40+50=100-x\)

\(90=100-x\)

\(\Rightarrow x=10\)

Answer 8

12 + 13 = 35 - 10

40 + 45 = 100 - 10 chúc bạn học tốt nha !

Answer 9

a ) 12+13=35-x

25=35-x

35-25=x

10=x

hay x=10

b) 40+50=100-x

90=100-x

100-90=x

10=x

hay x=10

Answer 10

1)12+13=35-x                                                  2)40+50=100-x

   25     =35-x                                                         90  =100-x

   35-x   =25                                                        100-x =90

        x   =35-25                                                         x =100-90

        x    =10                                                             x=10

Vậy x=10                                                    Vậy x=10

Answer 11

12+13=35-x

25=35-x

x=25+35

x=60

40+50=100-x

90=100-x

x=100-90

x=10