Question

calcule:
a) 4 × =28
b) 9 × =18
c) 5 × =20
d) 7 × - 1 = 13
e) 6 × = 2 × + 28

Answer 1

a) 4 × =28 ==. x = 28/4 ==. x = 7

b) 9 × =18 ==. x = 18/9 ==> x=2

c) 5 × =20 ==> x = 20/5 ==> x= 4

d) 7 × - 1 = 13 ==> 7x = 13+1 ==. 7x = 14 ==. x= 2 

e) 6 × = 2 × + 28 ==> 6x -2x = 28 ==> 4x = 28 ==> x = 28/4==. x= 7