0.55×30.4+0.48×52.5 巧算

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0.55×30.4+0.48×52.5巧算0.55×30.4+0.48×52.5巧算0.55×30.4+0.48×52.5巧算0.55×30.4+0.48×52.5=1.1×15.2+0.12×210

0.55×30.4+0.48×52.5 巧算
0.55×30.4+0.48×52.5 巧算

0.55×30.4+0.48×52.5 巧算
0.55×30.4+0.48×52.5
=1.1×15.2+0.12×210
=16.72+25.2
=41.92