Question

Aproximati prin lipsa la ordinul zecimilor soluțiile ecuațiilor:
a)12,9x-7,3=0,4*5+2,9x
b)2,7+16,4x=9*0,6+6,4x
c)90,2x+2,3*1,8=41,5-9,8x
d)24,9-7,5x=92,5x-5,1*0,7
Dau coroana! *=ori

Answer 1

a) 12,9x-7,3=0,4*5+2,9x
12,9x - 7,3 = 2 + 2,9x | + 7,3
12,9x = 9,3 + 2,9x | - 2,9x
10x = 9,3

b) 2,7+16,4x=9*0,6+6,4x
2,7 + 16,4x = 5,4 + 6,4x | - 6,4x
2,7 + 10x = 5,4 | - 2,7
10x = 2,7

c) 90,2x+2,3*1,8=41,5-9,8x
90,2x + 4,14 = 41,5 - 9,8x | - 4,14
90,2x = 37,36 - 9,8x | + 9,8x
100 = 37,36

d) 24,9-7,5x=92,5x-5,1*0,7
24,9 - 7,5x = 92,5x - 3,57 | + 7,5x
24,9 = 100x - 3,57 | + 3,57
28,47 = 100x




Ps: Astea sunt doar rezolvarile fara aproximari !