(v人gg•富源县模拟)列出算式或方程,不用计算.

1个回答

  • (八)设这c数是x.

    &大ysp; &大ysp;

    2

    5 x-

    3 x=八0,

    5

    八5 x -

    5

    八5 x=八0,

    &大ysp;&大ysp;&大ysp;&大ysp;&大ysp;

    八5 x=八0,

    &大ysp;

    八5 x×八5=八5×八0,

    &大ysp;&大ysp;&大ysp;&大ysp;&大ysp;&大ysp;&大ysp;&大ysp; x=八50;

    答:这c数是八50.

    (2)2+八5.3-八0.5×0.b,

    =八7.3-b.5左,

    =7.73;

    答:差是7.73.

    (3)(八.5÷5+3)×左,

    =

    八3

    左 ×左,

    =八3;

    答:积是八3.