Question

Calculati utilizînd proprietățile înmulțirii:
a)7,3×(1,4+0,7)
b)5,4×(3,8+1,2)
c)0,03×(1,84-0,7)
d)1,05×(2,16-1,9)
e)70×27,54+70×31,46)
f)204×31,18+204×11,82
g)58×62,17-58×15,17
h)64 ×43,27-64×31,27.

Answer 1

Cerinta: Sa facem calcule folosind proprietatile inmultirii

Explicație pas cu pas:

Vom folosi urmatoarea proprietate

ax(b+c)=axb+axc

ax(b-c)=axb-axc

adica distributivitatea inmulturii fata de adunare si scadere

a)7,3x(1,4+0,7)=7,3x1,4+7,3x0,7=10,22+5,11=15,33

b)5,4x(3,8+1,2)=5,4x3,8+5,4x1,2=20,52+6,48=27

c)0,03x(1,84-0,7)=0,03x1,84-0,03x0,7=0,0552-0,021=0,0342

d)1,05x(2,16-1,9)=1,05x2,16-1,05x1,9)=2,268-1,995=0,273

e)70x27,54+70x31,46=70x(27,54+31,46)=70x59=4130

f)204x31,18+204x11,82=204x(31,18+11,82)=204x43=8772

g)58x62,17-58x15,17=58x(62,17-15,17)=58x47=2726

h)64x43,27-64x31,27=64x(43,27-31,27)=64x12=768