2. 333×334 = 333 x(3x 222+334)= 3x(666+334)= 3000
3, 999×999+1999 = 999 x(1000-1)+1999 = 999000-999+ 100999 = 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. p>
11. 132×288÷(24×11)= 112x 288/(24x 11)= 288/2 = 144
12. 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. p>p>
16.28×11111+99999×8 = 1111x(28+72)= 11165438+
17. -111 =1111-111+900=100900=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