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100

10-1

=9

100

1oo+200

=300

100

10×10

=100

100

20/5

=4

100

100+600

=700

200

80-52

=28

200

55+30

=85

200

5×4

=20

200

20/5

=4

200

5+5

=10

300

400-100

=300

300

117+53

=170

300

6×7

=42

300

10/2

=5

300

12×3

=36

400

900-132

=768

400

122+138

=260

400

3×6

=18

400

100/4

=25

400

0.5×22

=11

500

99-46

=53

500

1919+4567

=6486

500

25×3

=75

500

222/2

=111

500

100+999-99

=1009