4a/45(t-2)
/—это дробь, ×—умножить
(a/5t-10)-(a/9t-18)=9a-5a/9×5(t-2)=4a/45(t-2)
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4a/45(t-2)
/—это дробь, ×—умножить
(a/5t-10)-(a/9t-18)=9a-5a/9×5(t-2)=4a/45(t-2)