Divided into 42 parts of 2 1 and 19 parts.

Divided by 2 1.

You get 2 and 19, 1.

The math problem is 8.25 * 340+4.5 * 825+2100 * 0.825 = 82.5 * 34+82.5 * 45+82.5 * 21= 82.5 * (34+45+2/kloc

43 and 65438+2/09 divided by 2 1 simple calculation 43 and 65438+2/09 divided by 2 1

=(42+ 1 and 65438+2/09) ÷ 2 1

= (42+ 19 of 21) ÷2 1

=42÷2 1+ 19 part21÷ 21

2+ 19 of = 1

=2 19 1

Cleverly calculate 42 35 2 1 divided by 34 42 35 2 1 34.

=34÷34+(8+3/5)÷34

= 1+43/5÷34

= 1+43/ 170

= 070 1 and 65438+43.

If b = b in A and c = 2 in B are divided by C, then the square of B-the square of C -ac+bc-2a+2b=? Math topic b/a=c/b=2/c

Available:

c^2=2b,2a=bc b^2=ac

b^2-c^2-ac+bc-2a+2b

=ac-2b-ac+bc-bc+2b

=ac-ac+(-2b+2b)+(bc-bc)

=0

Hope to adopt, thank you!

Mathematics topic, 999 has 998 times 999+ 1, and the score can be calculated skillfully and simplified. In detail, 999 times 999 times 999+ 1 is better.

=( 1000- 1/999)*999+ 1

=9990000- 1+ 1

=9990000

Math problems (to write the calculation process, primary school will solve it) are urgent! June = 1 12.5% May

Compared with May, sales in June increased by112.5%-1=12.5%.

20 14: 20 15 times 20 13, and find the method 2015 * 2013/2014 = (2014.

Or:

20 15*20 13/20 14

=(2000+ 15)(2000+ 13)/20 14

=(2000*2000+( 15+ 13)*2000+ 15* 13)/20 14

=(4000000+56000+ 195)/20 14

=4056 195/20 14

Skilled mathematical problem calculation121.018 *13 (118/121) */kloc-0.

=( 1-3/ 12 1)* 13

= 13-39/ 12 1

= 12+ 1-39/ 12 1

= 12+82/ 12 1

= 1534/ 12 1

Mathematical problems of calculation 02 4+ 17/27

=(4×27+ 17)/27

= 125/27

=(5/3)?

So the original formula =5/3.