简便计算过程①1/2X1/15+1/3X1/2②5/6X5/9+5/9X1/6③3/9X7/16X2/9④2/5X4X3/4⑤4/5X7/9X8/5⑥5/7X16X1/5
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①1/2X1/15+1/3X1/2
=1/2×(1/15+1/3)
=1/2×(1/15+5/15)
=1/2×6/15
=1/2×2/5
=1/5
②5/6X5/9+5/9X1/6
=5/9×(5/6+1/6)
=5/9×1
=5/9
③3/9X7/16X2/9
=1/3×7/8×1/9
=7/216
④2/5X4X3/4
=2/5×1×3
=6/5
⑤4/5X7/9X8/5
=224/225
⑥5/7X16X1/5
=1/7×16
=16/7
=1/2×(1/15+1/3)
=1/2×(1/15+5/15)
=1/2×6/15
=1/2×2/5
=1/5
②5/6X5/9+5/9X1/6
=5/9×(5/6+1/6)
=5/9×1
=5/9
③3/9X7/16X2/9
=1/3×7/8×1/9
=7/216
④2/5X4X3/4
=2/5×1×3
=6/5
⑤4/5X7/9X8/5
=224/225
⑥5/7X16X1/5
=1/7×16
=16/7
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谢谢~
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