57)
(27+5+16):2×9-2×a = 100
48:2×9-2×a = 100
24×9-2×a = 100
216-2×a = 100
2×a = 216-100
2×a = 116
a = 116:2
a = 58
58)
(96+16:4)-5×(a+3)+100:10-10a = 65
(96+4)-5×(a+3)+10-10a = 65
100-5×a-15+10-10a = 65
10×a+5×a = 100+10-65
15×a = 45
a = 45:15
a = 3
60)
f) z+15-4×75:3 = 300
z+15-300:3 = 300
z+15-100 = 300
z = 300+100-15
z = 400-15
z = 385
g) 334-[(6×4+6×6):n]+324 = 652
334-[(24+36):n]+324 = 652
334-(60:n) = 652-324
334-(60:n) = 328
60:n = 334-328
60:n = 6
n = 60:6
n = 10
h) [(a+260:2)×3+4]×5 = 1985
[(a+130)×3+4] = 1985:5
(a+130)×3+4 = 397
(a+130)×3 = 397-4
(a+130)×3 = 393
a+130 = 393:3
a + 130 = 131
a = 131-130
a = 1
i) [(b+27)×2-325]×3 = 1047
(b+27)×2-325 = 1047:3
(b+27)×2-325 = 349
(b+27)×2 = 349+325
(b+27)×2 = 674
b+27 = 674:2
b+27 = 337
b = 337-27
b = 310
j) (m+3711)×2-235+21 = 7800
(m+3711)×2 = 7800-21+235
(m+3711)×2 = 8014
m+3711 = 8014:2
m+3711 = 4007
m = 4007-3711
m = 296
Spor la scris si vacanta frumoasa!!!
