Question

Помогите с 4номером и 5номером

Answer 1

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Answer 2

4.
7/13+1/13=8/13
3/10+1/7=21/70+10/70=31/70
9/25+2/5=9/25+10/25=19/25
1/25+3/35=7/175+15/175=22/175
5/7-2/7=3/7
7/9-1/4=28/36 - 9/36=19/36
7/25 - 1/36=252/900 - 25/900=227/900
25/24 : 15/16=25/24 * 16/15=(5*2)/(3*3)=10/9=1 1/9
5/9 * 18/37=10/37
(3/4)³ =3³/4³=27/64
6/7 : 3=6/7 * 1/3=2/7
8 : 4/5=8 * 5/4=2*5=10

5.
х:2=17
х=17*2
х=34

х*12=144
х=144:12
х=12

120:х=10
х=120:10
х=12

х+18=115
х=115-18
х=97

х - 10=208
х=208+103
х=311

156-х=105
х=156-105
х=51