1: 55 11.85
3.2 1.08
5/6 2
2: =4×25×0.27
=100×0.27
=27
=3.8÷﹙99+1﹚
=3.8×100
=380
560÷16÷5
=560÷﹙16×5﹚
=560÷80
=7
﹙8+4/9﹚÷4
=8÷4+4/9÷4
=2+1/9
1
= 2 ----
9
2/5+3/7+3/5+4/7
= ﹙2/5+3/5﹚+﹙3/7+4/7﹚
=1+1
=2
=7/16×﹙9-7﹚
=7/16×2
=7/8
3: =0.4×30
=12
=﹙3.8-0.9﹚×0.5
=2.9×0.5
=1.45
=1/4×4×4×4
=16
=8/13×1/7+1/7×5/13
=1/7×﹙8/13+5/13﹚
=1/7×1
=1/7
4: 14×24×25÷28÷30
=10
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