100.51.5×4=6.4÷0.8=7.2×0.01=10÷4=0.36×2=1÷0.125=0.25×8=8.1÷0.3=0.1×0.02=1.6÷16=2.4×2.5=3.2÷1.6=1.5+0.25×4=3.5+7.6=3×0.2×0.5=12-6.2-3.8=8×(2.5+0.25)=2.56-0.37=0.125÷0.25=7×1.6+7×0.4=2041.3.7×0.8()5.6()2.8.59696……(),()3.3454.X7.2()X61.5()5.6.4=()1.2=()()“√”“×”411.01,2.3.33333()3.()4.()(41)1.0.65×201=0.65×(200+1)=0.65×200+0.65().A.B.C.2.()A.a+a2aB.a×2a2C.a+aa23.,().A.5+XB.4X=0C.4X-6>54.,,,().A.B.C.2(34)1,(16,4)8.65-3.7+1.35-6.3[2.1+3.61÷(7.2-5.3)]×301.2+36÷[1.44×(0.1-0.05)](16.5×3+3×7.5)÷62,(8,4)18.7-χ=7.83×0.5+6χ=3.33(10,5)(1)321.5,()(2)4230723084,?()287114448602053015.1(20%)(1)5.1×0.65.1×6(2),()(),,()(3)25×18=4502.5×0.182.5×1.8450÷1.8(4)9.9459(5)9.648÷0.240.249.648()(6)4÷7,()(7)○“”“”“”0.97×0.89○0.971.01×0.97○0.977.6×0.8○7.6+0.87.6÷0.12○7.67.6÷1.2○7.67.6÷0.12○7.6×0.12(8)12(3%)(1)21.1210010A2112B211.2C21.12D2.112(2)60.8÷163.81A60.8÷1.638.1B6.08÷160.381C608÷1638.1D6.08÷0.163.81(3)0.8×(12.5×1.25)ABC1(8%)18×0.32.8÷140.84÷20.6×0.5×43.4×01.08+0.81.6×50.2+0.8÷212÷510÷0.012.1÷78.74-8.74÷8.740÷9.41.25×0.41÷4(1-0.5)×0.52(10%)80.5×2.30.942.054.520.362.8621.0847.04563.080.273(8%)9.085.4511.924.551.25×30×1.2×0.8(1.2512.50.25)×822.619×22.614(12%)7.42.6×4.85.20.389.62÷3.7×5.44.38÷(36.9434.30.2)(3.80.7)×(22.422.4÷4)[(5.843.9)÷0.40.15]×0.9295.2÷[32.5(22.08÷41.02)]5(8%)(1)300.757.5(2)4.61.58.51.7(3)4.21.8(4)62.3537.6512.57.6(31%)1(1)3000101201012(2)5360121200(1)4.260.44(2)542.560.25(3)300151.5(4)1537501.2(5)4.30.312001×20=2015.32×0.52.8×523.8×20.0210033.5=230=40.51055÷662.0582.0582.0582.058“”79.909090……891210281511ta12ab513a3b1×5=510.7777213.243243……13.2433451×5=51