Question

Rezolvați următoarele ecuații:
a)8x-1,2 la puterea a doua =7-2x
b)7x+1,4 la puterea a doua =8-3x
c)2,5 la puterea a doua +103x=8+3x
d)1,6la puterea a doua +108x=8x+7
Dau coronița la cel sau cea care răspunde corect!!!

Answer 1

a)
8x-1,2²=7-2x
8x-1,44=7-2x
8x+2x=7+1,44
10x=8,44
x=0,844
b) 
7x+1,4²=8-3x
7x+1,96=8-3x
7x+3x=8-1,96
10x=6,04
x=0,604
d)
1,6²+108x=8x+7
2,56+108x=8x+7
108x-8x=7-2,56
100x=4,44
x=0,0444
c)
2,5²+103x=8+3x
6,25+103x=8+3x
103x-3x=8-6,25
100x=1,75
x=0,0175