340÷5+340÷5

=68+68

= 136

2.

55× 10 1-55+ 16×25

=55×( 100+ 1)-55+400

=5500+55-55+400

=5900

3.

842 1-277-623+579

=842 1+579-(277+623)

=9000-900

=8 100

4.

(364-456)-(544-636)

=364-456-544+636

=364+636-(456+544)

= 1000- 1000

=0

5.

62×4+44×5+5× 18

=62×4+5×(44+ 18)

=62×4+5×62

=62(4+5)

=62*9

=558

6.

6200÷ 124

=50

7.

(7500÷ 15)÷(25×2)

=500÷50

= 10

8.

3400-62×34-38×20-38× 14

=3400-62×34-38(20+ 14)

=3400-62×34-38×34

=3400-34(62+38)

=3400-34* 100

=3400-3400

=0