Réponses

  • Utilisateur Brainly
2014-02-10T19:48:50+01:00
A=3x(-5)^{2}+2x(-4)^{3}
A= 3* (-5)*(-5)+2*(-4)*(-4)*(-4)
A= 3*25+2*16*(-4)
A=75+(-8)*16
A=75-128
A=-53

B=5^{-2}x10^{3}-23x5^{-1}
B= 5*(-2)*1000-23*1/5
B= -10*1000-4,6
B= -10000-4,6
B= -10004,6

C= \frac{7^2+2^5}{3^5-2X9^2}
C=(7*7+2*2*2*2*2)/(3*3*3*3*3-2*9*9)
C=(49+32)/(243-2*81)
C=81/(243-162)
C=81/81
C=1