Question

Resolva as equações: 2x+5=11
7x-1=20
x²=100
21x-17=109
9+4=x
resposta​

Answer 1

Resposta:

7x-1=20

7x=20+1

×=21÷7

×=3

x²=100

x=raiz de 100

x= 10

21x-17=109

21x=109+17=

x= 126÷21

X=6

9+4=x

x=13