1. х*4*25=х*100=100х
25у+13х+23у+13=48у+13х+13
2. 13х+5х+10х-8х=20х, при х=5
20*5=100
25у*4у*8у=800у^3, при у=4
800*4^3=51200
3. 29х-15х+16=100
14х+16=100
14х=100-16
14х=84
х=6
4. (х-16)*9=126
9*х-16*9=126
9х-144=126
9х=126+144
9х=270
х=30
5. (18+5х):11=3
18+5х=33
5х=33-18
5х=15
х=3
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Answers & Comments
1. х*4*25=х*100=100х
25у+13х+23у+13=48у+13х+13
2. 13х+5х+10х-8х=20х, при х=5
20*5=100
25у*4у*8у=800у^3, при у=4
800*4^3=51200
3. 29х-15х+16=100
14х+16=100
14х=100-16
14х=84
х=6
4. (х-16)*9=126
9*х-16*9=126
9х-144=126
9х=126+144
9х=270
х=30
5. (18+5х):11=3
18+5х=33
5х=33-18
5х=15
х=3