Simple algorithm of 99 × 97 + 97

Simple algorithm of 99 × 97 + 97

99×97＋97
=97x(99+1)
=97x100
=9700

Simple algorithm of 99 * 99 * 99 + 99 * 99

99*99*(99+1)
=99*(100-1)*100
=(99*100-99)*100
=(9900-99)*100
=9801*100
=980100
I haven't learned square. I can only do this

Simple algorithm of 99 * 99% + 99%

99*99%+99%
=(99+1)x99%
=100x99%
=99

Simple algorithm of 7.7 * 6.7 + 6.7 * 7.6 * 99

Original formula = 1 * 7.6 * 6.7 + 7.6 * 6.7 * 99
=(1+99)*7.6*6.7
=100*7.6*6.7
=5092

Simple algorithm for square minus one of 99

Use (A & # 178; - B & # 178;) = (a + b) (a-b)
99²-1
=（99+1）×（99-1）
=9800

38 × 1 1 / 1999 + 8 × 1 / 1999 + 1998 × 1 / 18 / 36

1998 1 38×1----- + 8-----×1----×36 1999 1999 18 1999+1 8×1999+1998 19=38×------ + ------------×----×36 1999 1999 18 1999+1 9×1999-1 =38×-...

A simple algorithm of 98 × 99 / 98 × 98 / 1

98 × 99 / 98 × 98 / 1
=98×1/98×98/99
=1×98/99
=98/99

38 times 1:1999 plus 8:1999 1998 times 1:18 divided by 36:1=

38 times 1:1999 plus 8:1999 1998 times 1:18 divided by 36:1 = 38 times 1:1999 plus 8:1999 1998 times (1:18 × 36) = 38 times 1:1999 plus 8:1999 1998 times 38 = 38 times (1:1999 plus 8:19

How to write the simple algorithm of 99 times 99 plus 99?

99×99+99
=99×(99+1)
=99×100
=9900

12 out of 17 * 13 out of 9-12 out of 17 / 9 out of 4

12 out of 17 * 13 out of 9-12 out of 17 / 9 out of 4
=12 out of 17 * 13 out of 9-12 out of 17 * 4 out of 9
=12/17(13/9+4/9)
=12/17*(17/9)
=12/9
=4/3