Răspuns :
a) -5x3+10= -15+10= -5
b) -5x(-7)+(-5)+(-7)+(-5)x3= 35 -12 -15= 8
c) -5(-7+3)= -5* (-4)= 20
d) -8x6+(-8)x(-7)= -48+56= 8
e) 12+(-12)x35+12x34= 12 - 420+408= -408+408=0
f) 3(1+2+3+............+1000)+(1+2++.............+1000)x(-3)=
= 3*1000*1001: 2 - 3* 100*1001 : 2= 1501500 - 150150= 0
b) -5x(-7)+(-5)+(-7)+(-5)x3= 35 -12 -15= 8
c) -5(-7+3)= -5* (-4)= 20
d) -8x6+(-8)x(-7)= -48+56= 8
e) 12+(-12)x35+12x34= 12 - 420+408= -408+408=0
f) 3(1+2+3+............+1000)+(1+2++.............+1000)x(-3)=
= 3*1000*1001: 2 - 3* 100*1001 : 2= 1501500 - 150150= 0