104.
1. x+23=41
x=41-23
x=18
2.36+y=74
y=74-36
y=38
3.85+z=97
z=97-85
z=12
4.x-61=17
x=17+61
x=78
5.46-y=24
y=46-24
y=22
6.53-z=25
z=53-25
z=28
7.m:21=10
m=10×21
m=210
8.192:n=16
n=192:16
n=16
9.k:44=20
k=20×44
k=880
105.
1.12x=60
x=60:12
x=5
2.33y=132
y=132:33
y=4
3.51z=357
z=357:51
z=7
4.2x-15=13
2x=13+15
2x=28
x=28:2
x=14
5.7y-25=45
7y=25+45
7y=70
y=70:7
y=10
6.130-4x=70
130-70=4x
60=4x
x=60:4
x=15
7.49-3x=34
49-34=3x
15=3x
x=15:3
x=5
8.9y-89=55
9y=55+89
9y=144
y=144:9
y=16
9.74-8z=2
74-2=8z
72=8z
z=72:8
z=9