1:30+1:х=1/18
(х+30):30х=1/18
18х+540-30х=0
12х-540=0
12х=540
х=540/12
х=45
за 45 минут.
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1:30+1:х=1/18
(х+30):30х=1/18
18х+540-30х=0
12х-540=0
12х=540
х=540/12
х=45
за 45 минут.