Question

Rezolvati ecuatiile:a)8x-1,2^2=7-2x;b)2,5^2+103x=8+3x;c)1,6^2+108x=8x+7. Dau coroana.

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) 2.5²+103x=8+3x

6.25+103x=8+3x

103x-3x=8-6.25

100x=1.75

x=0.0175

c) 1.6²+108x=8x+7

2.56+108x=8x+7

108x-8x=7-2.56

100x=4.44

x=0.0444

Answer 2

a)8X-1,2^2=7-2X
8X-1,2×1,2=7-2X
8X-1,44=7-2X
8X+2X-1,44=7
10X-1,44=7
10X=7+1,44
10X=8,44
X=8,44×10
X=84,4



b)2,5^2+103X=8+3X
2,5×2,5+103X=8+3X
6,25+103X=8+3X
6,25+103X-3X=8
100X=8-6,25
100X=1,75
X=1,75:100
X=0,0175




c)1,6^2+108X=8X+7
1,6×1,6+108X=8X+7
2,56+108X-8X=7
2,56+100X=7
100X=7-2,56
100X=4,44
X=4,44:100
X=0,0444