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3*1+2=1+4
b)4x+1=6x-?
4*1+1=6*1-1
c)2x-3=x+?
2*1-3=1+(-2)
-1=1+(-2)
nie jestem pewna czy dobrze to zrozumiałam, ale jak coś to bym to tak zrobiła ;)
3x+2=x+4 |-x
2x+2=4 |-2
2x=2 |:2
x=1
b)4x+1=6x-1 gdyż:
4x+1=6x-1 |+1
4x+2=6x |-4x
2=2x |:2
1=x
c)2x-3=x+(-2) gdyż:
2x-3=x+(-2) = 2x-3=x-2
2x-3=x-2 |+3
2x=x+1 |-x
x=1
2x=-2+?
x=(-2+?)/2
?=4
spr: x=(-2+4)/2=2/2=1
b)4x+1=6x-?
-2x=-1-?
?=1
spr -2x=-1-1
-2x=-2
x=1
c)2x-3=x+?
x=3+?
?=-2
spr: x=3-2=1