=2 1×(67+ 18)+85×79

=2 1×85+85×79

=85×(2 1+79)

=8500

2.375 ×480 + 6250 ×48

=480×(375+625)

=480000

3.32 1 ×8 1 + 32 1 × 19

=32 1×(8 1+ 19)

=32 100

4.222222 ×999999

=222222×( 1000000- 1)

=222222000000-222222

=22222 1777778

5.333333 ×333333

= 1 1 1 1 1 1×999999

= 1 1 1 1 1 1×( 1000000- 1)

= 1 1 1 1 1 1000000- 1 1 1 1 1 1

= 1 1 1 1 10888889

6.65432 1 ×909090 +65432 1×90909

=65432 1×999999

=65432 1×( 100000- 1)

=65432 1000000-65432 1

=654320345679

7.34 ×3535 -35 ×3434

=34×35× 10 1-35×34× 10 1

=0

8.345345 ÷ 150 15

=345× 100 1÷( 15× 100 1)

=345÷ 15× 100 1÷ 100 1

=23

9.75 ×45 + 17 ×25

=25×3×45+ 17×25

=25×( 135+ 17)

=25× 152

=25×4×38

=3800

10.(48 ×75 ×8 1)÷(24 ×25 ×27)

=48÷24×75÷25×8 1÷27

=2×3×3

= 18