320x(1.25+2.5+0.5)巧算

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320x(1.25+2.5+0.5)巧算320x(1.25+2.5+0.5)巧算320x(1.25+2.5+0.5)巧算320x(1.25+2.5+0.5)=320x1.25+320x2.5+320x

320x(1.25+2.5+0.5)巧算
320x(1.25+2.5+0.5)巧算

320x(1.25+2.5+0.5)巧算
320x(1.25+2.5+0.5)
=320x1.25+320x2.5+320x0.5
=320x5/4+320x5/2+320x1/2
=400+800+160
=1360