递等式计算:(能简算的用简便方法计算)

1个回答

  • (1)(5.81-2.09)×3.5,

    =3.72×3.5,

    =13.02;

    (2)2.5×8×0.5+40,

    =2.5×4×2×0.5+40,

    =(2.5×4)×(2×0.5)+40,

    =10×1+40,

    =10+40,

    =50;

    (3)3.865+1.92+3.135+2.08,

    =(3.865+3.135)+(1.92+2.08),

    =7+4,

    =11;

    (4)5.8×6.1+3.2×6.1+6.1,

    =(5.8+3.2+1)×6.1,

    =10×6.1,

    =61;

    (5)16÷0.25÷0.4,

    =16÷(0.25×0.4),

    =16÷0.1,

    =160;

    (6)(750-366)÷48×[25÷(210-209)],

    =384÷48×[25÷(210-209)].

    =384÷48×[25÷1],

    =384÷48×25,

    =8×25,

    =200.