Question

tìm x biết:x*7+x*9-x-x*5=790

Answer 1

x * 7 + x * 9 -  x - x * 5 = 790

x * 7 + x * 9 - x * 1 - x * 5 = 790

x * ( 7 + 9 - 1 - 5 ) = 790

x * 10 = 790

x = 79

Answer 2

79 nha ban minh giai tren Violympic toan dung

Answer 3

to nghi la  79

Answer 4

tớ có cách giải rất phức tạp x*7+x*9-x-x*5 =790

(2x *16-x) -x*5

2x*15-x*5

x*(15-5)

x*10

x=790:10

x=79                                                                                       100%luôn

Answer 5

79 tớ giải trên violympic toán rồi 

Answer 6

79 dung 1111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Answer 7

79 nha tien

Answer 8

79 nha tien