13/17×5/6+17/13÷6
=13/17×5/6+17/13×1/6
=13/17×(5/6+1/6)
=17/13×1
=17/13
1.8×3/4+1.2×3/4-3/4
=(1.8+1.2-1)×3/4
=2×3/4
=3/2
13/17×5/6+17/13÷6
=(65/17+17/13)/6
=(1134/17x13)/6
=189/221
(2)1.8×3/4+1.2×3/4-3/4
=18x3/40 +12x3/40 -30/40
=(54+36-30)/40
=3/2
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