Question

16:(9-Х)+8=10;  (4хХ-130):7=50

Answer 1

16/(9-х)=2; 16=2(9-х); 8=9-х; х=1; (4х-130)/7=50; 4х-130=350; 4х=480; х=120

Answer 2

16 :( 9 - х ) + 8 = 10

16 :(9 - х ) =10 - 8 

16 :(9 -х) = 2 

9 -х =16 :2

9 -х =8

х =9 -8 

х =1

проверка :

16 : ( 9 - 1 )+8 = 10

                  10=10

 

(4 *х - 130) : 7 = 50

4х -130 =50 * 7 

4х - 130 = 350

4х =350 +130

4х =480

х =480 : 4 

х =120

проверка :

(4 *120 - 130) : 7 =50

                      50=50

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