计算下面各题,能简算的要简算.37+125+63+175 (630-125÷25)×6 688-(534-112) 15

1个回答

  • 解题思路:(1)运用加法交换律与结合律简算;

    (2)先算括号内的除法,再算括号内的减法,最后算括号外的乘法;

    (3)运用减法的性质以及加法交换律简算;

    (4)(8)(10)运用乘法分配律简算;

    (5)把88看作8×11,运用乘法结合律简算;

    (6)运用除法的性质简算;

    (7)两个括号同时计算,最后算乘法;

    (9)先算乘法,再算减法和加法.

    (1)37+125+63+175,

    =(37+63)+(125+175),

    =100+300,

    =400;

    (2)(630-125÷25)×6,

    =(630-5)×6,

    =625×6,

    =3750;

    (3)688-(534-112),

    =688-534+112,

    =(688+112)-534,

    =800-(500+34),

    =800-500-34,

    =300-34,

    =266;

    (4)156×101-156,

    =156×(101-1),

    =156×100,

    =15600;

    (5)125×88,

    =125×8×11,

    =1000×11,

    =11000;

    (6)4700÷25÷4,

    =4700÷(25×4),

    =4700÷100,

    =47;

    (7)(750+120)×(35+65),

    =870×100,

    =87000;

    (8)97×99+97,

    =97×(99+1),

    =97×100,

    =9700;

    (9)630-29×17+56,

    =630-493+56,

    =193;

    (10)47×28+71×47+47,

    =47×(28+71+1),

    =47×100,

    =4700.

    点评:

    本题考点: 整数四则混合运算;运算定律与简便运算.

    考点点评: 此题主要考查整数的四则混合运算的运算顺序和应用运算定律进行简便计算.