用简便方法计算下面各题:①:6/11x(5/8+7/12)②:14/15X7/8x15③:(3/4+5/8)x32 ④:1/4x2/5X5/6⑤:13/11x3/5-3/5X2/11 要脱式计算和简便计算

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用简便方法计算下面各题:①:6/11x(5/8+7/12)②:14/15X7/8x15③:(3/4+5/8)x32 ④:1/4x2/5X5/6⑤:13/11x3/5-3/5X2/11 要脱式计算和简便计算
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用简便方法计算下面各题:①:6/11x(5/8+7/12)②:14/15X7/8x15③:(3/4+5/8)x32 ④:1/4x2/5X5/6⑤:13/11x3/5-3/5X2/11 要脱式计算和简便计算
用简便方法计算下面各题:①:6/11x(5/8+7/12)②:14/15X7/8x15③:(3/4+5/8)x32 ④:1/4x2/5X5/6
⑤:13/11x3/5-3/5X2/11 要脱式计算和简便计算

用简便方法计算下面各题:①:6/11x(5/8+7/12)②:14/15X7/8x15③:(3/4+5/8)x32 ④:1/4x2/5X5/6⑤:13/11x3/5-3/5X2/11 要脱式计算和简便计算
①6/11×(5/8+7/12)
=6/11×5/8+6/11×7/12
=15/44+7/22
=15/44+14/44
=29/44
② 14/15×7/8×15(约分)
=49/4
③ (3/4+5/8)×32
=3/4×32+5/8×32
=24+20
=44
④ 1/4×2/5×5/6(约分)
=1/12
⑤ 13/11×3/5-3/5×2/11
=(13/11-2/11)×3/5
=1×3/5
=3/5
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