155 - (155-200) is calculated by a simple method

155 - (155-200) is calculated by a simple method

155-(155-200)
=155-155+200
=200
Please comment
~The mobile questioner can click "satisfied" in the upper right corner of the client
~If you agree with my answer, please click the "adopt as satisfactory answer" button in time~
~Your adoption is my driving force~~

A simple method of 93 times 65 minus 43 times 60

93×65-43×60
=（50+43）×65-43×60
=50×65+43×（65-60）
=3250+215
=3465
Have a good time

Calculation of 645-239 + 155-61 with simple method

645-239+155-61
=(645+155)-(239+61)
=800-300
=500

Calculation of 72 + 89-72 + 89 628-155-45 + 72 with simple method

72+89-72+89
=72-72+（90-1）*2
=180-2
=178
628-155-45+72
=（628+72）-（155+45）
=700-200
=500