怎么进行简便计算?1/5×27+3/5×41 , 1/17×4/9+5/17×1/9 5/6×1/13+5/9×2/13+5/18×3/13
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1/5×27+3/5×41
=3/5×9+3/5×41
=3/5×(9+41)
=3/5×50
=30
1/17×4/9+5/17×1/9
=1/9×4/17+1/9×5/17
=1/9×(4/17+5/17)
=1/9×9/17
=1/17
5/6×1/13+5/9×2/13+5/18×3/13
=1/6×5/13+2/9×5/13+1/6×5/13
=5/13×(3/18+4/18+3/18)
=5/13×5/9
=25/117
=3/5×9+3/5×41
=3/5×(9+41)
=3/5×50
=30
1/17×4/9+5/17×1/9
=1/9×4/17+1/9×5/17
=1/9×(4/17+5/17)
=1/9×9/17
=1/17
5/6×1/13+5/9×2/13+5/18×3/13
=1/6×5/13+2/9×5/13+1/6×5/13
=5/13×(3/18+4/18+3/18)
=5/13×5/9
=25/117
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