用简便方法运算。[1-(2/3+1/5)÷7/10]=？

如题所述

解：1-(2/3+1/5)÷7/10
=1-(2/3+1/5)×10/7
=10/7×7/10-(2/3+1/5)×10/7
=10/7×(7/10-2/3-1/5)
=10/7×(1/2-2/3)
=-10/7×1/6
=-5/21

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