Question

ari 4. Calculaţi: a) 5² +9²-25; b) 3-7²-42; c) 3-4³ +2.9²; d) (3³-6):21; e) (12² - 11²): 120; f) 5¹ (13² +4³); g) (192-172) (10³ -15² h) 20²-2.10² +10-2²; i) 20³ (16²- 4²).​

Answer 1

Răspuns:

a) 5²+9²-25 = 25+81-25 = 81

b) 3-7²-42 = 3-49-42= -88

c) 3-4³+2•9²= 3-64+2•81 = 101

d)(3²-6)÷21= (9-6)÷21 = 3÷21=3/21=0.142

e)(12²-11²)÷120= (144-121)÷120= 23/120= 0.191

f) 5¹(13²+4³)=5•(169+64)=1165

g)(192-172)(10³-15²)=20•775=15500

h)20²-2•10²+10-2²=400-200+10-4= 206

i)20³(16²-4²)= 8000(256-16)=1920000

Answer 2

Răspuns:

a) 25+81-25=81

b)3-49-42=-88

c)3-64+8,41=-69,41

d)(27-6):21=1

e)(144-121):120=nu e posibil

f) 5*(169+64)=1165