Răspunsuri

2014-09-17T16:57:16+03:00
Se inmulteste fiecare coeficient cu numerele din paranteze avand grija la semne:
a. 4*6+4*9=24+36=60
5*7-5*3=35-15=20

b. 6*7+8*7=42+56=98
10*9-2*9=90-18=72

c. 3*7+3*8+3*5=21+24+15=60
2*4+6*4+9*4=8+24+36=68

d. 2*8-2*3-2*2=16-6-4=6
10*6-5*6-3*6=60-30-18=12

e. 9*8+9*4-9*7=72+36-63=45
5*3-2*3+9*3=15-6+27=36