=34×3.5× 1.0 1-3.5×34× 1.0 1

=0

8+89+899+8999+89999

=9+90+900+9000+90000-5

=99999-5

=99994

0.67×2. 1+0.0 18×2 1+8.5×0.79

=0.67×2. 1+0. 18×2. 1+8.5×0.79

=(0.67+0. 18)×2. 1+8.5×0.79

=0.85×2. 1+0.85×7.9

=0.85×(2. 1+7.9)

=0.85× 10

=8.5

22222.2×9.99999

=22222.2×( 10-0.0000 1)

=222222-0.222222

=22222 1.777778

1997× 1996 1996- 1996× 1997 1997

= 1997× 1996× 1000 1- 1996× 1997× 1000 1

=0

0.02+0.04+0.06+0.08+……+ 19.94+ 19.96+ 19.98

=(0.02+ 19.98)×999÷2

= 10×999

=9990

99999×77778+33333×66666

=99999×77778+99999×22222

=99999×(77778+22222)

=99999× 100000

=9999900000

(4 5/6-3 3/4)/(3/ 14+2/7)

= 13/ 12÷ 1/2

= 13/6

=2 and 1/6

(4.8/ 1 and 4/5+3 and 1/2+7 and 1/3)*4/9

=(2 2/3+7 1/3+3.5)*4/9

=( 10+3.5)*4/9

= 13.5*4/9

=6

17.2/(3 2/5- 1.25)*2/3

= 17.2/2. 15*2/3

= 17.2÷43/3

= 1.2

5*5 and 1/5

=5*5+5* 1/5

=25+ 1

=26

(5 2/5- 1.8)/[( 1. 15+ 13/20) * 1 2/3]

=3.6/[ 1.8*5/3]

=3.6/3

= 1.2

3 5/8*5 1/5+5 1/5*6 3/8.

=5.2*(3 5/8+6 3/8)

=5.2* 10

=52

[3/4-7/8/(5/6+4/5)]*28

=[3/4-7/8÷49/30]*28

=[3/4- 15/28]*28

=3/4*28- 15/28*28

=2 1- 15

=6

(1.25 * 4/5-0.76)/(1and 3/8+ 1 and 1/40)

=( 1-0.76)/2.4

=0.24/2.4

=0. 1

[(0.2+ 1/3)*4.5]/(8 and 1/20-6.45)

=8/ 15*4.5/ 1.6

=2.4/ 1.6

= 1.5

(4 6/7+ 1.75)/ 1 and1114+3 and 5/6.