计算,能用简便方法计算的要写出简算的主要过程.5.24+7.9+4.76 25×37×4 5.12-1.47-2.53

1个回答

  • (1)5.24+7.9+4.76

    =5.24+4.76+7.9

    =10+7.9

    =17.9;

    (2)25×37×4

    =25×4×37

    =100×37

    =3700;

    (3)5.12-1.47-2.53

    =5.12-(1.47+2.53)

    =5.12-4

    =1.12;

    (4)56×125

    =7×(8×125)

    =7×1000

    =7000;

    (5)96.2+78-6.2

    =96.2-6.2+78

    =90+78

    =168;

    (6)450÷5÷9

    =450÷(5×9)

    =450÷45

    =10;

    (7)52×23+48×23

    =(52+48)×23

    =100×23

    =2300;

    (8)510-240÷12×15

    =510-20×15

    =510-300

    =210;

    (9)156×101-156

    =156×(101-1)

    =156×100

    =15600;

    (10)(2400-80×20)÷20

    =(2400-1600)÷20

    =800÷20

    =40;

    (11)4.5+3.15-4.5+3.15

    =4.5-4.5+(3.15+3.15)

    =0+6.3

    =6.3.