c.)2½×(5 3/5+1 2/7)
=2½×(5+1 +3/5+2/7)
=2½×(6+21/35+10/35
=2½×(6+31/35)
=5/2(6+31/35)
=15+155/70
=15+2 15/70
=17+3/14
----------------------------------
d.)3 2/5÷(2½-1 3/5)+1/3×2 4/5
=3 2/5÷(5/2-8/5)+1/3×14/5
=3 2/5÷(25/10-16/10)+14/15
=3 2/5÷(9/10)+14/15
=17/5×10/9+14/15
=170/45+14/15
=170/45+42/45
=212/45
=4 32/45
e.)4/5+3 2/4÷½-(1½+2½)
=4/5+3½÷½-(1,5+2,5)
=4/5+3½×2/1-(4)
=4/5+7-4
=4/5+3
=3,8
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Penyelesaian:
c.)2½×(5 3/5+1 2/7)
=2½×(5+1 +3/5+2/7)
=2½×(6+21/35+10/35
=2½×(6+31/35)
=5/2(6+31/35)
=15+155/70
=15+2 15/70
=17+3/14
----------------------------------
d.)3 2/5÷(2½-1 3/5)+1/3×2 4/5
=3 2/5÷(5/2-8/5)+1/3×14/5
=3 2/5÷(25/10-16/10)+14/15
=3 2/5÷(9/10)+14/15
=17/5×10/9+14/15
=170/45+14/15
=170/45+42/45
=212/45
=4 32/45
----------------------------------
e.)4/5+3 2/4÷½-(1½+2½)
=4/5+3½÷½-(1,5+2,5)
=4/5+3½×2/1-(4)
=4/5+7-4
=4/5+3
=3,8