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199 * 101-199, 80.1 * 10.1-808, 2.8 * 3 / 4 + 0.75 * 6.2 + 3 / 4
199*101-199=199*（101-1）=199*100=1990080.1*10.1-808=10.1*（80.1-80）=10.1*0.1=1.012.8*3/4+0.75*6.2+3/4=3/4*(2.8+6.2+1)=3/4*10=7.5
Simple calculation of [0.75 + 0.9] times 0.4
0.75*0.4+0.9*0.4=0.3+0.36=0.66
Simple calculation of 0.99 × 5.4
Subtract 0.01 from 10 and multiply by 5.4
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