[2.25+(18/5\1.8-1.21*5/11)]\40%=
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[2.25+(18/5\1.8-1.21*5/11)]\40%=
[2.25+(18/5\1.8-1.21*5/11)]\40%=
[2.25+(18/5\1.8-1.21*5/11)]\40%=
[2.25+(18/5\1.8-1.21*5/11)]\40%
=(2.25+2-0.55)/40%
=3.7*2.5
=9.25
[2.25+(18/5\1.8-1.21*5/11)]\40%=
[2.25+(0.02-0.55)]\40%=
[2.25+(0.02-0.55)]\40%=
1.72\40%=
4.3
计算机