Question

                                      rezolvați ecuațiile:

a) 2x-1=3·(x+1)-7
b) -2+2·(x+1)=3x-5
c) (x+2)÷3=4
d) 10·($( 2^{3}- 2^{2}- 2^{0})$÷x=1

Answer 1

a) 2x-1=3·(x+1)-7
2x-1=3x+3-7
x=3

b) -2+2·(x+1)=3x-5
 -2+2x+2=3x-5
+2x=3x-5
x=5

c) (x+2)÷3=4
 x+2=12
x=10

d) 10·(2³-2²-2⁰)÷x=1
 10·(8-4-1)÷x=1
30:x=1
x=30