Question

1.Calculati, respectand ordinea efectuarii operatiilor: a)20+(1,6x4,5-2,3) b) 2+1,2x[3+54x(1,7x3-0,5x2)] c)14,3x100-5,6x10 d)0,15+(1,473x10-0,02x100)x2,5 2. Calculati produsul dintre suma si diferenta numerelor 206,13 si 107,2

Answer 1

a) 20+(7,2-2,3)
20+4,9=24.9
b)2+1,2•[3+54•(1.7•3-0,5•2)]
2+1,2•[3+54•(5,1-1)]
2+1,2•(3+54•4,1)
2+1,2•(3+221,4)
2+1,2•224.4
2+268.28=271.28
c)14,3•100-5,6•10
1430-56=1374
d)0,15+(1,473×10-0,02×100)×2.52
0,15+(14730-2)×2.52
0,15+14728×2.52
0.15+37114.56=37114.41
e)206,13+107,2=313,33
206,13-107,2=98,93
313,33×98,93=30997,7369