упростите выражение
а) 11/13 х+2/13 х
б) 7/8 а-9/16 а
в) 5 1/6 b+ 2/3 b
г) 7 3/4 y- 2 7/8y
д) 2 1/2 х-( 1 1/4х - 1 1/5х)
е) 3 4/5х - ( 2 3/4 х -1 1/5х)
ж) 3 7/15х- ( 2 1/2х- 1 3/15х)
з) 4 7/32х - (3 3/4х -1 7/32х)
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