Question

13/17×5/6+17/13÷6简便运算

1.8×3/4+1.2×3/4-3/4简便

Answer 1

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

Answer 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

Answer 3

13/17×5/6+17/13÷6=17/13（5/6+1/6）=17/13
1.8×3/4+1.2×3/4-3/4=3/4(1.8+1.2-1)=3/2