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x=7-3 1/2
x=3 1/2
b)3/5+t=9/10
t=9/10-3/5
t=9/10-6/10
t=3/10
c)x/1,5=10 /*1,5
x=15
d)y-6i1/5=12i1/2
y=12 1/2+6 1/5
y=12 5/10 + 6 2/10
y=18 7/10
e)2/3=5t/*3
2=15t/:15
t=7,5
f)4/5=2/15n/*15
12=2n/:2
n=6
g)2/3n=1i1/9/*3
2n=1 1/3/:2
n=5/6
h)6i2/3=c+4
c=4-6 2/3
c=-2 2/3
i)1/3x=2,1/*3
x=6,3
j)0,01c=0,25/*100
c=25
z.63 Rozwiąż równania :
a)2x-9= 7+x
2x-x=7+9
x=16
b)2(1-x)=-3x-61+4x
2-2x=-3x-61+4x
-2x+3x-4x=-61-2
-3x=-63/:(-3)
x=21
c)2x-5(0,2x-5)=3(x-5)-20
2x-x+25=3x-15-20
2x-x-3x=-15-20-25
-2x=-60/:(-2)
x=30
d)2x+3(22-x)=x-3(8-x)
2x+66-3x=x-24+3x
2x-3x-x-3x=-24-66
-5x=-90/:(-5)
x=18
e)2(x-1)-3(1+3x)=3x-7(6+x)-5
2x-2-3-9x=3x-42-7x-5
2x-9x-3x+7x=-42-5+3+2
-3x=-42/:(-3)
x=14