计算下面各题,注意使用简便方法 (3/4-2/3)÷1/5 (3/8+7/12)×8+1/
计算下面各题,注意使用简便方法(3/4-2/3)÷1/5(3/8+7/12)×8+1/174/5×7/8+7/8÷5(1-8/15×3/4)÷3/5...
计算下面各题,注意使用简便方法
(3/4-2/3)÷1/5
(3/8+7/12)×8+1/17
4/5×7/8+7/8÷5
(1-8/15×3/4)÷3/5 展开
(3/4-2/3)÷1/5
(3/8+7/12)×8+1/17
4/5×7/8+7/8÷5
(1-8/15×3/4)÷3/5 展开
展开全部
(3/4-2/3)÷1/5
=(9/12-8/12)X5
=1/12X5
=5/12
(3/8-7/12)X8+1/17
=3/8X8-7/12X8+1/17
=3-14/3+1/17
=5/3+1/17
=88/51
4/5X7/8+7/8÷5
=4/5X7/8+7/8X1/5
=(4/5+1/5)X7/8
=1X7/8
=7/8
(1-8/15X3/4)÷3/5
=(1一2/5)X5/3
=3/5X5/3
=1
=(9/12-8/12)X5
=1/12X5
=5/12
(3/8-7/12)X8+1/17
=3/8X8-7/12X8+1/17
=3-14/3+1/17
=5/3+1/17
=88/51
4/5X7/8+7/8÷5
=4/5X7/8+7/8X1/5
=(4/5+1/5)X7/8
=1X7/8
=7/8
(1-8/15X3/4)÷3/5
=(1一2/5)X5/3
=3/5X5/3
=1
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