cine ma ajuta va rog la ex 37 pana la53 dau coroana
Răspunsuri la întrebare
Răspuns:
500___________________
37.
(1800 - 1200) : 100 + 220 x 42 + (1296 : 3 - 12 x 5) =
600 : 100 + 9240 + (432 - 60) =
6 + 9240 + 372 = 9618
38.
(200 : 5 - 72 : 2 + 936 : 3) - (175 - 55 : 5 + 22 x 4) =
(40 - 36 + 312) - (175 - 11 + 88) =
316 - 252 = 64
39.
1 x 2 x 3 x a = 24
6 x a = 24
a = 24 : 6 = 4
40.
a x 2 x 5 = 140
a x 10 = 140
a = 140 : 10 = 14
41.
36 : 3 : 3 x a = 20 x 2
4 x a = 40
a = 40 : 4 = 10
42.
a : 8 + 20 000 = 20 003
a : 8 = 20 003 - 20 000 = 3
a = 8 x 3 = 24
43.
(64+123+239) x a = 1278
426 x a = 1278
a = 1278:426 = 3
44.
(394 - 123 - a) : 2 = 108
394 - 123 - a = 108 x 2 = 216
271 - a = 216
a = 271 - 216 = 55
45.
4 x 5 : 10 + a = 331
20:10 + a = 331
2 + a = 331
a = 331 -2 = 319
46.
(23 124 + 10 692 - 33 016) : a = 4
4 x a = 800
a = 800 : 4 = 200
47.
(324:2 + 345:5) + 12 346 = 4 x a + 12 177
(162+69) + 12 346 = 4 x a + 12 177
231 + 12 346 = 4 x a + 12 177
4 x a + 12 177 = 12 577
4 x a = 12 577 - 12 177 = 400
a = 400:4 = 100
48.
x · 2 : 5 = 4
x · 2 = 4 · 5 = 20
x = 20 : 2 = 10
49.
(4 · a + 5) - 6 x 2 = 5
(4 · a + 5) - 12 = 5
4 · a + 5 = 5 + 12 = 17
4 · a = 12
a = 12:4= 3
50.
a : 2 + (123 x 3 - 53 x 4) = 257
a : 2 + (369 - 212) = 257
a : 2 + 157 = 257
a : 2 = 257 - 157 = 100
a = 2 x 100 = 200
51.
(a - 387 : 9) : 3 = 2185 - 1879
(a - 43) : 3 = 306
a - 43 = 306 x 3 = 918
a = 918 + 43 = 961
52.
(24+24 : 4) x 5 x 2 : a = 300 : 100
(24+6) x 5 x 2 : a = 3
30 x 5 x 2 : a = 3
300 : a = 3
a = 300 : 3 = 100
53.
(a - 933 : 3 + 300) x 2= 978
a - 311 + 300 = 978 : 2 = 489
a = 489 - 300 + 311 = 500