Tour to MATHEMATICS

+

50

2 + 7

=9

75

10 + 12

=12

100

45 + 23

=68

150

78 + 125

=203

222

345,23 + 98,1

=443,33

-

50

12 - 4

=8

75

23 - 12

=11

100

76 - 39

=37

150

459 - 235

=224

222

848,2 - 229,69

=618,51

x

50

3 x 5

=15

75

4 x 14

=56

100

12 x 11

=132

150

23 x 109

=2507

222

123,5 x 130,2

=16079,7

:

50

40 : 4

=10

75

120 : 3

=40

100

220 : 20

=11

150

875 : 25

=35

222

345,9 : 0,2

=1729,5

find x

50

1 + x = 45

x=44

75

34 - x = -23

x=57

100

x² + x - 2 = 0

x=1 or x=-2

150

30x² - 20x = 0

x=2/3 or x=0

222

(3x² + 4x)(2x² + x - 10)= 0

x=2

x=-5/2

x=0

x=-4/3