Efectuati: 1)a.77:(-11)+15 b.-13+10:(-2) c.-100:(-25)+7. (-3) 2) a) -50+50:50-50 b)100:(-25)+0:(- 1499)+1:1 c)-1000-34300:10:(-5) 3)Stiind ca ab+ac=-32 si ca a=-4,calculati b+c. 4)Stiind ca xa+xb-xc=288 si ca a+b-c=-9,aflati x. 5)a)[-2.(-3).(-7)+(-4)]:(-4+27) b) (-12+15+10-13):(15-28+12) c)[23-(-14).23]:15.

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Răspunsuri

2014-05-24T17:46:29+03:00
1) a . -7+15=+8
b.-13-5=-18
c.+4-21=-17
2)a. -50+1-50= -49-50=-99
b.-4+0+1=-3
c.-10000+686=-9314
4)
x(a+b-c)=288
x*(-9)=288
x=288:(-9)
x=-32
3)
a(b+c)=-32
-4(b+c)=-32
b+c=-32:(-4)
b+c=8
5)a. [-42+(-4)]:23
-46:23=-2
b.0:(-1)=0
c.(23+322):15=23
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