3. Вычислите значение выражения а) 76,58* 100 -38,5*3,7

б) 6/5 + 3\4 * 4/15

4. решите уравнения: а) 2,4 ( 5х-6) = х-3,4

б) 5,4х- (3х-4,9)= 2х+( 7,8_4х)
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