1、 能简算的要简算30.814(9.851.07) 60(9.528.9)0.18 2.8810.430.243.5 20(2.441.8)0.40.15 28-(3.4+1.252.4) 2.557.1+2.457.1 7779+1113 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 19464.81.80.9 36.724.259.9 51807056 242.42.50.8 (4121+2389)7 67115-974 46912+1492 405(3213-3189) 3.416（0.01635）
2、0.8(106.76)1.2 19.46.12.3 5.670.2-0.62 18.10.92+3.93 0.043-0.24+0.875 0.40.70.25 0.75102 +100-56.23 0.78+5.436+1 4.070.86+9.12.5 30.814(9.851.07) 60(9.528.9)0.18 2.8810.430.243.5 20(2.441.8)0.40.15 28-(3.4+1.252.4) 2.557.1+2.457.1 7779+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 19464.81.80.9 36.724.259.9 51807056 242.42.50.8 (4121+2389)7 67115-974 46912+1492 405(3213-3189) 3.416（0.01635） 0.8(106.76)1.2 19.46.12.3 5.670.2-0.62 18.10.92+3.93 0.40.70.25 0.78+5.436+1 4.070.86+9.12.5 3
