Răspuns :
x: 0,3²=7,5 => x: (1/3)²=15/2 => x:1/9 = 15/2 => x=(15/2)*(1/9) => x=5/6 = 0,8(3)
(5,21+x)*10²=805,8 => 5,21 +x= 8,058 => x= 8,058-5,21 => x=2,848
(5,21+x)*10²=805,8 => 5,21 +x= 8,058 => x= 8,058-5,21 => x=2,848
A) x : 0,3²= 7,5
x:0,09=7,5
x=7,5·0,09
x=0,675
B) ( 5,21 + x ) • 10² = 805 ,8
(5,21+x)·100=805,8
5,21+x=805,8:100
5,21+x=8,058
x=8,0258-5,21
x=5,848
x:0,09=7,5
x=7,5·0,09
x=0,675
B) ( 5,21 + x ) • 10² = 805 ,8
(5,21+x)·100=805,8
5,21+x=805,8:100
5,21+x=8,058
x=8,0258-5,21
x=5,848