Question

Calculeaza necunoascuta :

1 ) ( 362 : a + 364 ) : 5 x 16 - 1344 = 400
2 ) ( 138 x 5 - 21 : 7 - 300 x 2 ) - 9 x 9 - a x 2 = 2
3 ) [ ( 26 - a ) x 9 : 3 ] + 108 x 7 = 900 - 84

Answer 1

(362:a+364):5x16-1344=400
(362:a+364):5x16=400+1344
(362:a+364);5x16=1744
(362:a+364):5=1744:16
(362:a+364):5=109
362:a+364=105x9
362:a+364=545
362:a=545-364
362:a=181
a=362:181
a=2
[(26-a)X9:3]+108X7=900-84
[(26-a)x3]+756=816
[(26-a)x3=816-756
(26-a)x3=60
26-a=60:3
26-a=20
a=26-20
a=6
(138x5-21:7-300x2)-9x9-ax2=2
(690-3-600)-81-ax2=2
87-81-ax2=2
6-ax2=2
ax2=6-2
ax2=4
a=4:2
a=2
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