Question

Efectuați calculele:
A) 2x•0,5y-0,3x•5y+1,25x•y+0,5x•0,5y
B)0,(5)a•0,3b+0,5a•1,(6)b-2,3•3ab+0,9ab
C)0,7(a+b-c)-0,3(2a-b+2c)-0,1(a-10c)

Answer 1

Răspuns:

Explicație pas cu pas:

A) x*y(0.3*5+1.25+0.5*0.5) = x*y(1.5+1.25+0.25)= x*y*(2.75+0.25)= x*y*3.00= x*y*3

B)a*b[0.(5)*0.3+0.5*1.(6)-2.3*3+0.9]=

AB(5/9*3/10+5/10*(16-1)/9-23/10*3+9/10)

AB(1/6+5/6-69/10+9/10)

AB(6/6-60/10)

AB(10/10-60/10)

AB*(-50/10)=-5ab

C)0.7a+0.7b-0.7c-0.6a-0.3b-0.6c-0.1a+c=0.4b-0.3c