给四年级找一个简单的操作题。

1、125×28+375×20 = 125 x4x 7+13 x25 x4x 5 = 500 x7+500 x13 = 500 x(7+13)= 500 x20 = 10000

2、999×222+333×334 = 333 x(3x 222+334)= 3x(666+334)= 3000

3、999×999+1999 = 999 x(1000-1)+1999 = 999000-999+1000+999 = 100000

4、145×48-24×90 = 24x(145 x2-90)= 24x(290-90)= 4800

5、888×6+222×76 = 222 x(4x 6+76)= 222 x 100 = 22200

6、125÷102×555×204÷111÷25 = 125×555×204/(102×11x 25)=(125/25)x(555

7、4×77+99×8 = 11x(28+72)= 1100

8、99×27-33×51+66×35 = 33x(81-51+70)= 33x 100 = 3300

9、9393×94-9494×93 = 93x 101x 94-94x 101x 93 = 0

10、93×93-92×91 =(92+1)x93-92x 91 = 92x 93-92x 91+93 = 92 x2+92+1 = 92 x3+1 = 276+1 = 277

11、132×288÷(24×11)= 112x 288/(24x 11)= 288/2 = 144

12、36×96+24×56 = 24x(36x 4+56)= 24x4x(36+14)= 24x4x 50 = 24x 200 = 4800

13、1116+9876×9 = 9x(124+9876)= 9x 10000 = 90000

14、37×3838-38×3737 = 37×38×101-38×37×101 = 0

15、49+993×7=7x(7+993)=7000

16、28×11111+99999×8 = 1111x(28+72)= 11165438+

17、(9999+8100)÷9-111=(1111+900)-111=1111-111+900=1000+900=1900

18、99×78+33×66 = 99x 78+33x3x 22 = 99x(78+22)= 9900

19、48×29+13×16 = 16x(3x 29+13)= 16x(87+13)= 1600