计算下面各题.(能简算的要简算,并写出主要的计算过程) 6.7×7.3+6.7×1.7+6.7 1.25×0.25×32

1个回答

  • 解题思路:(1)根据乘法分配律进行简算;

    (2)把32拆成4×8,然后再根据乘法交换律和结合律进行简算;

    (3)先算除法,再算减法;

    (4)根据乘法分配律进行简算;

    (5)根据乘法分配律进行简算;

    (6)3.73连续除以2.5与4,等于除以2.5与4的乘积.

    (1)6.7×7.3+6.7×1.7+6.7,

    =6.7×(7.3+1.7+1),

    =6.7×10,

    =67;

    (2)1.25×0.25×32,

    =1.25×0.25×(4×8),

    =(1.25×8)×(0.25×4),

    =10×1,

    =10;

    (3)21.36÷0.8-12.9,

    =26.7-12.9,

    =13.8;

    (4)25.6-25.6×0.8,

    =25.6×(1-0.8),

    =25.6×0.2,

    =5.12;

    (5)7.65×101-7.65,

    =7.65×(101-1),

    =7.65×100,

    =765;

    (6)3.73÷2.5÷4,

    =3.73÷(2.5×4),

    =3.73÷10,

    =0.373.

    点评:

    本题考点: 小数四则混合运算;运算定律与简便运算.

    考点点评: 根据题意,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.