How to calculate 2.18 + 7.2 - [4.2-1.82] with a simple method

How to calculate 2.18 + 7.2 - [4.2-1.82] with a simple method


2.18+7.2-[4.2-1.82]
=(2.18+1.82)+(7.2-4.2)
=4+3
=7
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How to calculate 630 / 18 / 5?


630/18/5
=630÷(18x5)
=630÷90
=7



How to use the simple method of 82 + 52 + 48 + 18


82+52+48+18
=(82+18)+(52+48)
=100+100
=200



6 / 7 + 5 / 9 * 3 / 2 + 1 / 6 =? 18 * (1 / 2 + 1 / 3-1 / 6) =? With a simple method
You'd better give it to me in ten minutes


*Is it multiplication?