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小数混合运算专项训练1、解方程。(1)5x450 (2)12(6x)42 (3)1.26+4x12 (4)8.5xx22.52、用简便方法计算。(1)0.25 3.212.5 (2)3610.1(3)0.2544 (4)22.24+17.843、用脱式计算。(1)2.6+1.41.51.5 (2)(373.64.8)12.5(3)2.6+2.4(1.41.05) (4)15.616(0.25+1.25)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 0.40.70.25 0.78+5.436+1 4. 8 54+14 9. 9x56+56 10. 34x89-13 14. 31x56-56 16. 59x18-14x27 20. 3x29+13 35. 95(64-45) 36. 178-14556+42 7.20.8-1.25 6.5(4.8-1.24) 28-(3.4+1.252.4) 2.557.1+2.457.1 7779+11113 (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) 19.46.12.3 5.670.2-0.62 18.10.92+3.93 0.04324+0.875 0.40.70.25 0.78+5.436+1 4.070.86+9.12 24078(154-115) 14372727563 75-(12+18)15 2160(83-79)18 280840245 32513(266250) 85(95144024) 58870(105202) 14372727563 81432(135278) 37.85-(7.85+6.4) 30(947599)7664 36(91327623) 192(5438)67 81432(135278)(947599)7664 60(9.528.9)0.182.8810.430.243.5 0.815.5-(3.21+5.79)31.8 3.24)5 19464.81.80.9 36.724.259.9 3.416(0.01635)0.8(106.76)1.2 (6.8-6.80.55)8.5 0.12 4.80.124.8 (58+37)(64-95) 812-700(9+3111) 156(17.7-7.2)3(3.21.5+2.5)1.6 85+14(14+20826) 120-36418+35 9.721.6-18.3057 3.2(1.5+2.5)1.6 (58+37)(64-95) (6.8-6.80.55)8.5 0.12 4.80.124.8 (3.21.5+2.5)1.6 120-36418+35 15-10.750.4-5.7 347+452-416052 (58+37)(64-95) (7.1-5.6)0.9-1.15 2.5(3.21.5+2.5)1.6 5.42.6(3.7-2.9)+0.62126(12-7.2)-6 3.26+(1.5+2.5)1.6(3.21.5+2.5)1.6 120-14418+35 347+452-416052 (58+37)(64-95) 95(64-45) 812-700(9+3111)120-36418+35 (6.8-6.80.55)8.5 0.12 4.80.124.8 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) 0.8(106.76)1.219.46.124 5.670.2-0.6218.10.92+3.9324+0.875990.40.70.250.75102 100-56.23 31.5016040 (58+370)(64-45) 32.120-14418+35 33.347+452-416052 34(58+37)(64-95) 35.95(64-45) 36.178-14556+42 420+580-642128 37.812-700(9+3111) (136+64)(65-34523) 38.85+14(14+20826) 120-36418+35 (58+37)(64-95) (6.8-6.80.55)8.5 0.12 4.80.124.8 (3.21.5+2.5)1.6 3.2(1.5+2.5)1.6 31.5016040 (58+370)(64-45) 32.120-14418+35 33.347+452-416052 34(58+37)(64-95) 35.95(64-45) 36.178-14556+42 420+580-642128 812-700(9+3111) (136+64)(65-34523) (284+16)(512-820818) 120-36418+35 (58+37)(64-95) (6.8-6.80.55)8.5 0.12 4.80.124.8 (3.21.5+2.5)1.6 (23.2(1.5+2.5)1.6 45.6-1.64= 5.38+7.85-5.37= 46
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