12.7－（3.7＋0.84）        36.54－1.76－4.54          0.25×0.73×4

7.6×0.8＋0.2×7.6            0.85×199              0.25×8.5×4

1.28×8.6＋0.72×8.6                12.5×0.96×0.8            10.4－9.6×0.35

0.8×（4.3×1.25）                   3.12＋3.12×99              28.6×101－28.6

（4.23＋6.17）×0.8             0.86×15.7－0.86×14.7                 2.4×102

14－7.32－2.68                2.64＋8.67＋7.36＋11.33             2.31×1.2×0.5