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rezolvati in multimea nr ecuatiile;2[x+3]+17=39; 7[x-2]+9 =44; 8[x+3]+7=71;; 5[2x-11]+17=52,; 6[3x+4]+15=201;17[2x+35]-35=366';4[5x-12]-34=118;125-3[2x-1]=98;238-5[x-1]=193 rog mult



Răspuns :

2[x+3]+17=39
2[x+3]=39-17
2[x+3]=12
2x+6=12
2x=12-6
2x=6
x=3

7[x-2]+9 =44
7[x-2]=44-9
7[x-2]=35
7x-14=35
7x=35+14
7x=49
x=7


8[x+3]+7=71
8[x+3]=71-7
8[x+3]=64
8x+24=64
8x=64-24
8x=40
x=5

5[2x-11]+17=52
5[2x-11]=52-17
5[2x-11]=35
10x-55=35
10x=35+55
10x=90
x=9