Răspunsuri

2014-10-07T01:25:27+03:00
10(A + B) - 2C = 10 * 4 + 2 * 5 = 40 + 10 = 50
[4(A + B) + C] * [3C - 2(A + B)] = (4 * 4  + 4 * 5) * (3 * 5 - 2 * 4) = (16 + 20) * (15 - 8) = 
36 * 7 = 252
X = - 2 *(A + 2B) + 15 , SIGUR E 4B?
Da
A DA, X + 2(A -2B) = 15 X + 2 * 5 = 15, X = 15 - 10, X = 5
25(A - 2B) + X = 200, 25 * 5 + X = 200, X = 200 - 125, X = 75
CAM ASTA E, MAI AI CEVA CA MI-E SOMN
2014-10-07T09:41:11+03:00
10a-2c+10b=10(a+b)-2c=10*4-2*5=40-10=30        (4a+c+4b)*[3c-(2a+2b]=4(a+b)*[3*5-2(a+b)=4*4*[15-2*4]=16*[15-8]=16*7=112
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