递等式计算(能简便的要简便) 0.11×1.8+8.2×0.11   2.34×99+2.34    5.4÷2.7×0

1个回答

  • 解题思路:①0.11×1.8+8.2×0.11,利用乘法的分配律变成0.11×(1.8+8.2)计算简便;

    ②2.34×99+2.34,利用乘法的分配律变成 2.34×(99+1)计算简便;

    ③5.4÷2.7×0.8,按从左到右的顺序依次计算;

    ④132×101,把101拆成(100+1),利用乘法的分配律计算;

    ⑤6.25÷1.25÷0.8变成6.25÷(1.25×0.8)计算简便;

    ⑥2.5×16,把16拆成4×4,再利用乘法的结合律计算.

    ①0.11×1.8+8.2×0.11,

    =0.11×(1.8+8.2),

    =0.11×10,

    =1.1;

    ②2.34×99+2.34,

    =2.34×(99+1),

    =2.34×100,

    =234;

    ③5.4÷2.7×0.8,

    =2×0.8,

    =1.6;

    ④132×101,

    =132×(100+1),

    =132×100+132,

    =13332;

    ⑤6.25÷1.25÷0.8,

    =6.25÷(1.25×0.8),

    =6.25÷1,

    =6.25;

    ⑥2.5×16,

    =(2.5×4)×4,

    =40.

    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: 考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.