Ответ:
(х+1,5х)÷2=55
2,5х=55×2
2,5х=110
х=110÷2,5
х=44
1,5×44=66
(44+66)÷2=55
110÷2=55
55=55
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Ответ:
(х+1,5х)÷2=55
2,5х=55×2
2,5х=110
х=110÷2,5
х=44
1,5×44=66
(44+66)÷2=55
110÷2=55
55=55