Question

Dacă x=5 si a+ b=13,calculați
a)3•x+7•a+7•b
b)x•a+x•b-50
c)10•x+(4•a+4•b)
d)(4•a+4•b-2•x)•(2•a+2•b+x)
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Answer 1

Răspuns:

a). =3x5+7(a+b)=15+7x13=15+91=106

b). =x(a+b)-50=5x13-50=65-50=15

c). =10x5+4(a+b)=50+4x13=50+52=102

d). =(4(a+b)-2x5))x(2(a+b)+5)=(4x13-10) x (2x13+5)=42x31=1302

Explicație pas cu pas:

Answer 2

a) 3•5 + 7(a + b) = 15 + 7• 13 = 15 + 91 = 106
b) x( a + b) - 50 = 5 • 13 - 50 = 65 - 50 = 15
c) 10•x + [4(a+b)] = 10•5 + (4•13) = 50 + 52 = 102
d) [4(a+b) -2•x] • [2( a+b) + x] = (4•13 - 2*5) • (2•13 + 5) = (52-10)•(26+5) = 42 • 31 = 1302