2、25.4 x 25.4+25.4+26.4 x 74.6 = 25.4 x(25.4+ 1+74.6)+ 100-25.4 = 2540+ 100 = 2640

Or 25.4x25.4+25.4+26.4x74.6 = 25.4x25.4+25.4+(25.4+1) = 2640.

9999× 1234-3333 x 3702 = 3333 x( 1234 x3-3702)= 3333 x(3702-3702)= 0

3, x+x+2+x+4+x+6+x+8 = 85, x = 13, the minimum value is 13, and the maximum value is 2 1.

4. Removing 0 is equivalent to 10 times smaller, so 572 is 1 1 times smaller, which can be solved as 52 and 520 respectively.

5、89x+90x24=3904

6. (33+33.5+34.5)-34.5 x2 = 32/33+33.5+34.5 is the total weight of three people, and 34.5x2 is the weight of Xiaoping and Xiao Qun, so the weight of three people minus the other two people is Kobayashi.

7、57-(42+35-29)=9

8、 18x( 15+ 1.5)- 1.5 = 295.5

9. The quotient is 4 and the remainder is 1.

10, 12, one fourth floor of B can't run to 1 building, and four fourth floors can't run to the fourth floor, so it's 12.

1 1, 8, 1, solution, it is impossible to be red on three sides except the corners. A square has eight corners, so there are eight, and none of them is red except the one in the middle.