数学问题:0.7×19又2/9+2又3/4×(-14)+0.7×7/9-3.25×14
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![数学问题:0.7×19又2/9+2又3/4×(-14)+0.7×7/9-3.25×14](/uploads/image/z/445550-14-0.jpg?t=%E6%95%B0%E5%AD%A6%E9%97%AE%E9%A2%98%EF%BC%9A0.7%C3%9719%E5%8F%882%2F9%2B2%E5%8F%883%2F4%C3%97%EF%BC%88-14%EF%BC%89%2B0.7%C3%977%2F9%EF%BC%8D3.25%C3%9714)
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数学问题:0.7×19又2/9+2又3/4×(-14)+0.7×7/9-3.25×14
数学问题:0.7×19又2/9+2又3/4×(-14)+0.7×7/9-3.25×14
数学问题:0.7×19又2/9+2又3/4×(-14)+0.7×7/9-3.25×14
0.7×19又2/9+2又3/4×(-14)+0.7×7/9-3.25×14
=0.7×19又2/9+0.7×7/9-3.25×14 +2又3/4×(-14)
=0.7(19又2/9+7/9)-14(3又1/4+2又3/4)
=0.7×20-14×6
=14(1-6)
=-70