=( 1+2-3)+(4+5-6)+...+(97+98-99)

=0+3+6+...+96

=(0+96)*33/2

= 1584

Elementary school math problems:1+2-3+4+5-6+7+8-9++97+98-99 =? 1+2-3 = 0 4+5-6 = 3 7+8-9 = 610+1-kloc-0/2 = 9 and so on. 99 divided by 3 = 33 97+98-99 = 96 94.

96 times 33=3 168

(1* 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 *10 */)/(1+2+3+4+5+6+7+8+9) Primary school mathematics.

=( 1*2*3*4*5*6*7*8*9* 10* 1 1)/66

= 1×2×3×4×5×7×8×9× 10

=604800

Calculate with a simple method:1+2-3-4+5+6-7-8+...+97+98-99-1001+2-3-4+5+6-7-8+ ...

=( 1+2-3-4)+(5+6-7-8)+(97+98-99- 100)

=-4* 100/4

=- 100

100÷4×( 1+2-3-4)=- 100

The solution of primary school math problems is very simple: on the basis of the original formula, add 2 1/20*2 1*22, and then add them in turn from back to front.

Can be excluded one by one, so the answer of the original formula is 1 15/462.

Solving Math Problems in Primary Schools (Simple Method Calculation) 1999+999×999

= 1000+999+999×999

= 1000+999×( 1+999)

= 1000+999× 1000

= 1000×(999+ 1)

= 1000× 1000

= 1000000

Calculate with a simple method:100+99-98-97+96+95-94-93+...+8+7-6-5+4+3-2-1100+99-99.

=( 100+99-98-97)+(96+95-94-93)+...+(8+7-6-5)+(4+3-2- 1)

=4+4+...+4+4 (25 in total)

= 100