1、50 道脱式计算30.814-(9.85+1.07) 60-(9.5+28.9)0.182.8810.43-0.243.5 20(2.44-1.8)0.4+0.1528-(3.4+1.252.4) 2.557.1+2.457.17779+11113 0.815.5-(3.21+5.79)(31.8+3.24) 5 31.54(6+3)0.64257.8+2.2 22.5+2.52 36.254.259.9 51807056 242.42.50.8 (4121+2389)7 67115-974 46912+1492 19.46.12.3 5.670.2-0.62 18.10.92+3.93 0.
2、40.70.25 0.78+5.436+1 4. 8 544 9. 9x56+9018 10. 3 x 4x84 14. 31x56 x 5 x 6 16. 5 x 9x18-14x27 20. 3x2 x 93 228（64-45） 36. 178-1455+42 7.20.8-1.25 6.5（4.8-1.24 ） 28-(3.4+1.252.4) 2.5511+2.4510 5559+11116（31.8+3.24 ）5 31.54(6+3) 0.64257.8+2.2 20.8+2.52 19464.81.80.9 36.724.259.9 51807056 242.42.50.8 (4121+2389)7 67115-974 46912+1492 405(3213-3189) 19.46.12.3 5.670.2-0.62
