4 przykłady ze sprawdzianu do poprawienia:
a) 7x-3+4y-5-9x-6y+8
b) -(3a-5b)+[-(7a+b)-(3a-2b)]
c) 9x-4=-22
d) -4(x+5)=(2x-7)
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a) 7x-3+4y-5-9x-6y+8 = -2x-2y = -2*(x+y)
b) -(3a-5b)+[-(7a+b)-(3a-2b)] = -3a+5b+(-7a-b-3a+2b) = -3a+5b-7a-b-3a+2b = -7a+6b
c)
9x-4=-22
9x = -22+4
9x = -18
x = -2
d)
-4(x+5)=(2x-7)
-4x-20 = x-7/2
-4x-x = -7/2+20
-5x =33/2
x = -33/10
x = -3,3
a)7x-3+4y-5-9x-6y+8=-2x-2y
b) -(3a-5b)+[-(7a+b)-(3a-2b)]=-3a+5b+(-7a-b-3a+2b)=-3a+5b-7a-b-3a+2b=-13a+6b
c) 9x-4=-22
9x=-22+4
9x=-18 /:9
x=-2
d)-4(x+5)=1/2(2x-7)
-4x-20=x-7/2
-5x=20-3,5
-5x=16,5 /:(-5)
x=-3,3