急急急 数学高手进来 明天要交作业
(-49)÷(2又1/3)7/3÷(-3)(-3/5)×(3又1/2)÷(-1又1/4)÷3-22/7×(22/7-4/3)×7/22÷(-22/21)要有过程...
(-49)÷(2 又1/3)7/3÷(-3)
(-3/5)×(3又1/2)÷(-1又1/4)÷3
-22/7×(22/7-4/3)×7/22÷(-22/21)
要有过程 展开
(-3/5)×(3又1/2)÷(-1又1/4)÷3
-22/7×(22/7-4/3)×7/22÷(-22/21)
要有过程 展开
展开全部
(-49)÷(2 又1/3)÷(-3)
=-49×3/7×(-1/3)
=49×3/7×1/3
=21×1/3
=7
(-3/5)×(3又1/2)÷(-1又1/4)÷3
=3/5×7/2÷5/4÷3
=3/5×7/2×4/5×1/3
=14/25
-22/7×(22/7-4/3)×7/22÷(-22/21)
=-(22/7-4/3)×(-21/22)
=(22/7-4/3)×21/22
=22/7×21/22-4/3×21/22
=3-14/11
=19/11
=1又8/11
=-49×3/7×(-1/3)
=49×3/7×1/3
=21×1/3
=7
(-3/5)×(3又1/2)÷(-1又1/4)÷3
=3/5×7/2÷5/4÷3
=3/5×7/2×4/5×1/3
=14/25
-22/7×(22/7-4/3)×7/22÷(-22/21)
=-(22/7-4/3)×(-21/22)
=(22/7-4/3)×21/22
=22/7×21/22-4/3×21/22
=3-14/11
=19/11
=1又8/11
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