1. Obicz; - trzy drugie + jedna cała i jedna druga=0
2. Rozwiąż równanie.
a) -2x +4= 5x+25
b) 7y-8= -y + 24
c) -8z+5= -z-1
d) -2m+7=m-6
e) 6-5x=2x-7
f)-5t+1=8-6t
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1) - trzy drugie + jedna cała i jedna druga=0
-3/2 + 1½ = 0
0=0 tożsamość (prawda ;-) )
2)
a) -2x +4= 5x+25
-2x-5x = 25 -4
-7x = 21 /:7
x= -21/3 = -7
b) 7y-8= -y + 24
7y+y = 24+8
8y = 32 /:8
y= 32/8 = 4
c) -8z+5= -z-1
-8z+z = -1-5
-7z = -6 /:(-7)
z = 6/7
d) -2m+7=m-6
-2m - m = -6 -7
-3m = -13 /:(-3)
m= 13/3 = 4⅓
e) 6-5x=2x-7
-5x-2x = -7-6
-3x = -13 /:(-3)
x = 13/3 = 4⅓
f)-5t+1=8-6t
-5t+6t = 8-1
t=7