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Răspunsuri la întrebare
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7.
a) x-|-6=3+|-8|
x+6=3+8
x+6=11
x=11-6
x=5
b)x+|2-6|=4²-|-2|
x+4=16+2
x+4=18
x=14
5. b) -5x=-20 c)3x=-9
x= +4 x=-3
e)x÷(-4)=-13 f)7x=-63
x=13×4 x=-9
x=52
h)-9÷x=1 i)8÷x=-2
x=9÷1=9 x=8÷(-2)
x=-4
k)-27÷(-x)=3
-x=-27÷3
x=9
6. a)x+16-30=-5
x= -5+30-16
x=-5+14
x=9
b)-(2-3)+x=21
-5+x=21
x=21+5
x=26
d) x+(-5+1)-6=-(-7)+1
x+(-4)-6=+7+1
x-4-6=8
x-10=8
x=8+10
x=18
9. i)-8-9x=19
-9x=19+8
-9x=27
x=-3
j)-8=4+3(x+2)
-8=4+3x+6
-8=3x+10
-3x=10+8
-3x=18
x=-6
k)4+10x=-16
10x=-16-4
10x= -20
x=-2
l)3x-4×[-5+(-2)²]=1
3x-4×[-5+4]=1
3x-4×(-1)=1
3x+4=1
3x=1-4
3x=-3
x=-1