用简便算法，计算下面各题
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2/9-7/16×2/9
=2/9×(1-7/16)
=2/9×9/16
=1/8
2/5×4×3/4
=2/5×(4×3/4)
=2/5×3
=6/5
5/7×16×21/5
=5/7×21/5×16
=3×16
=48
1/2×1/15+1/3×1/2
=1/2×(1/15+1/3)
=1/2×2/5
=1/5
4/5×7/9×5/8
=4/5×5/8×7/9
=1/2×7/9
=7/18
5/6×5/9+5/9×1/6
=(5/6+1/6)×5/9
=1×5/9
=5/9
=2/9×(1-7/16)
=2/9×9/16
=1/8
2/5×4×3/4
=2/5×(4×3/4)
=2/5×3
=6/5
5/7×16×21/5
=5/7×21/5×16
=3×16
=48
1/2×1/15+1/3×1/2
=1/2×(1/15+1/3)
=1/2×2/5
=1/5
4/5×7/9×5/8
=4/5×5/8×7/9
=1/2×7/9
=7/18
5/6×5/9+5/9×1/6
=(5/6+1/6)×5/9
=1×5/9
=5/9
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