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1、 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)8.5xx22.5(2)3610.12、用简便方法计算。(1)0.25 3.212.5(3)0.2544(4)22.24+17.843、用递等式计算。(1)2.6+1.41.51.5(2)(373.64.8)12.5(4)15.616(0.25+1.25)(3)2.6+2.4(1.41.05)30.814-(9.85+1.07)2.8810.43-0.243.528-(3.4+1.252.4)60-(9.5+28.9)0.1820(2.44-1.8)0.4+0.152.557.1+2.457.
2、17779+111130.815.5-(3.21+5.79) (31.8+3.24) 50.64257.8+2.236.254.259.9242.42.50.831.54(6+3)22.5+2.5251807056(4121+2389)767115-97446912+149219.46.12.35.670.2-0.620.78+5.436+118.10.92+3.934. 8 54+140.40.70.259. 9x56+5610. 34x89-1320. 3x29+137.20.8-1.252.557.1+2.457.114. 31x56-5616. 59x18-14x2736. 178-1
3、4556+4228-(3.4+1.252.4)(31.8+3.24)535. 95(64-45)6.5(4.8-1.24)7779+11113 31.54(6+3)0.64257.8+2.236.724.259.9(4121+2389)722.5+2.525180705667115-97419464.81.80.9242.42.50.846912+1492405(3213-3189)18.10.92+3.930.78+5.436+119.46.12.30.04324+0.8754.070.86+9.1275-(12+18)5.670.2-0.620.40.70.2524078(154-115)
4、14372727563152160(83-79)1885(95144024)28084024532513(266250)1437272756358870(105202)37.85-(7.85+6.4) 3036(91327623)81432(135278)(947599)7664192(5438)67 81432(135278)2.8810.430.243.519464.81.80.9(947599)766460(9.528.9)0.180.815.5-(3.21+5.79)(31.8 3.24)536.724.259.93.416(0.01635)0.8(106.76)1.2 (6.8-6.
5、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)1.685+14(14+20826)3.2(1.5+2.5)1.6120-36418+359.721.6-18.3057(58+37)(64-95)(6.8-6.80.55)8.51.60.12 4.80.124.8(3.21.5+2.5)120-36418+3515-10.750.4-5.7347+452-416052(58+37)(64-95)(7.1-5.6)0.9-1.15 2.5 (3.21.5+2.5)1.65.42.6
6、(3.7-2.9)+0.62126(12-7.2)-63.26+(1.5+2.5)1.6(3.21.5+2.5)1.6120-14418+35347+452-416052(58+37)(64-95)95(64-45)812-700(9+3111)120-36418+35(6.8-6.80.55)8.50.12 4.80.124.80.815.5-(3.21+5.79)(31.8+3.24)531.54(6+3)0.64257.8+2.222.5+2.5219464.81.80.936.724.259.951807056242.42.50.8(4121+2389)767115-97446912+
7、1492405(3213-3189)0.8(106.76)1.219.46.1245.670.2-0.6218.10.92+3.9324+0.875990.40.70.250.75102100-56.2331.5016040(58+370)(64-45)32.120-14418+3533.347+452-41605234(58+37)(64-95)35.95(64-45) 36.178-14556+42420+580-64212837.812-700(9+3111)(136+64)(65-34523)38.85+14(14+20826)120-36418+35(58+37)(64-95)(6.
8、8-6.80.55)8.50.12 4.80.124.8(3.21.5+2.5)1.63.2(1.5+2.5)1.631.5016040(58+370)(64-45)32.120-14418+3533.347+452-41605234(58+37)(64-95)35.95(64-45)36.178-14556+42420+580-642128812-700(9+3111)(136+64)(65-34523)(284+16)(512-820818)120-36418+35(58+37)(64-95)(6.8-6.80.55)8.50.12 4.80.124.8(3.21.5+2.5)1.6(23.2(1.5+2.5)1.645.6-1.64=5.38+7.85-5.37=46.70.8-1.25=6-1.193-0.43=47.6.5(4.8-1.24)=0.681.9+0.321.9297999198321+213017(0.123+123) 10093424+34810.80.196+0.094105+8955732.4723+2739.0118.3-901 76.5+2-218449+231431995299+522532125