..小数混合运算专项训练1、解方程。〔1〕5x＝450〔2〕12〔6－x〕＝42〔3〕1.2×6+4x＝12〔4〕8.5x－x＝22.52、用简便方法计算。〔1〕0.25×3.2×12.5〔2〕36×10.1〔3〕0.25×44〔4〕22.2×4+17.8×43、用脱式计算。〔1〕2.6+1.4×1.5－1.5〔2〕〔37－3.6÷4.8〕÷12.5-优选..〔3〕2.6+2.4×〔1.4－1.05〕〔4〕15.6÷16×〔0.25+1.25〕30.8÷[14-(9.85+1.07)][60-(9.5+28.9)]÷0.182.881÷0.43-0.24×3.520×[(2.44-1.8)÷0.4+0.15]28-(3.4+1.25×2.4)2.55×7.1+2.45×7.1777×9+1111×30.8×[15.5-(3.21+5.79)](31.8+3.2×4)÷531.5×4÷(6+3)-优选-.0.64×25×7.8+2.22÷2.5+2.5÷236.25÷4.25×9.95180－705×624÷2.4－2.5×0.8(4121+2389)÷7671×15-974469×12+149219.4×6.1×2.35.67×0.2-0.6218.1×0.92+3.930.4×0.7×0.25-.word.zl.-.0.78+5.436+14.8×5÷4+1÷49.9x5÷6+5÷610.3÷4x8÷9-1÷314.31x5÷6-5÷616.5÷9x18-14x2÷720.3x2÷9+1÷335.95÷〔64-45〕36.178-145÷5×6+427.2÷0.8-1.2×56.5×〔4.8-1.2×4〕28-(3.4+1.25×2.4)2.55×7.1+2.45×7.1777×9+1111×3-.word.zl.-.〔31.8+3.2×4〕÷531.5×4÷(6+3)0.64×25×7.8+2.22÷2.5+2.5÷2194－64.8÷1.8×0.936.72÷4.25×9.95180－705×624÷2.4－2.5×0.8(4121+2389)÷7671×15-974469×12+1492405×(3213-3189)19.4×6.1×2.35.67×0.2-0.62-.word.zl.-.18.1×0.92+3.930.043×24+0.8750.4×0.7×0.250.78+5.436+14.07×0.86+9.12240×78÷〔154-115〕1437×27＋27×563〔75-〔12+18〕〕÷152160÷〔〔83-79〕×18〕280＋840÷24×5325÷13×(266－250)85×(95－1440÷24)58870÷(105＋20×2)1437×27＋27×563-.word.zl.-.81432÷(13×52＋78)[37.85-〔7.85+6.4〕]×30〔947－599〕＋76×6436×(913－276÷23)[192－〔54＋38〕]×6781432÷(13×52＋78)〔947－599〕＋76×6460－(9.5＋28.9)÷0.182.881÷0.43－0.24×3.50.8×〔15.5-(3.21+5.79)〕-.word.zl.-.31.83.2×4〕÷5194－64.8÷1.8×0.936.72÷4.25×9.93.416÷〔0.016×35〕0.8×[(10－6.76)÷1.2](6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8〔58+37〕÷〔64-9×5〕812-700÷〔9+31×11〕156×[(17.7-7.2)÷3]〔3.2×1.5+2.5〕÷1.685+14×〔14+208÷26〕-.word.zl.-.120-36×4÷18+359.72×1.6-