12.3*3.1-9.2/3.1+7.7*3.1+15.4/3.

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12.3*3.1-9.2/3.1+7.7*3.1+15.4/3.
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12.3*3.1-9.2/3.1+7.7*3.1+15.4/3.
12.3*3.1-9.2/3.1+7.7*3.1+15.4/3.

12.3*3.1-9.2/3.1+7.7*3.1+15.4/3.
12.3*3.1-9.2/3.1+7.7*3.1+15.4/3
=12.3*3.1+7.7*3.1+15.4/3.1-9.2/3.1
=(12.3+7.7)*3.1+(15.4-9.2)/3.1
=20*3.1+6.2/3.1
=62+2
=64

12.3*3.1-9.2/3.1+7.7*3.1+15.4/3.1
=(12.3+7.7)*3.1+(15.4-9.2)/3.1
=20*3.1+6.2/3.1
=62+2
=64