3/7(-0,54)-1,56х3/7=3/7(-0,54-1,56)=3/7х(-2,1)=3/7х(-21/10)=-9/10=-0,9
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3/7(-0,54)-1,56х3/7=3/7(-0,54-1,56)=3/7х(-2,1)=3/7х(-21/10)=-9/10=-0,9