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31×29/41十69/41×29
=31×29/租卖卜信41+29/41×69
=(弊弊逗31十69)×29/41
=100×29/41
=2900/41
=31×29/租卖卜信41+29/41×69
=(弊弊逗31十69)×29/41
=100×29/41
=2900/41
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展开全部
31x29/41+69/41x29
=31x29/41+(40/轮槐搏腊祥41+29/41)x29
=31x29/41+29/41x29+40/41x29
=(31+29)x29/41+40/41x29
=60x29/41+29/41x40
=(60+40)x29/明轮41
=100x29/41
=2900/41
=31x29/41+(40/轮槐搏腊祥41+29/41)x29
=31x29/41+29/41x29+40/41x29
=(31+29)x29/41+40/41x29
=60x29/41+29/41x40
=(60+40)x29/明轮41
=100x29/41
=2900/41
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