www.ctrt.net > 脱式计算.(能简算的要简算,并写出主要的简便过...

脱式计算.(能简算的要简算,并写出主要的简便过...

(1)3.58-2.36-(2.64-1.42)=3.58-2.36-2.64+1.42=(3.58+1.42)-(2.36+2.64)=5-5=0;(2)(14+16?13)×12=14×12+16×12-13×12=3+2-4=1;(3)3.6×118+8.4÷811=3.6×118+8.4×118=(3.6+8.4)×118=12×118=332;(4)34÷[3.75×(1.2?15)]=34÷[3.75×1...

①125×45×16 =(125×8)×(45×2)=1000×90=90000②0.4÷23+1.6÷23 =(0.4+1.6)×32=2×32=3 ③45×27+15÷321 =45×27+15×7=835+4935=5735 ④5.6×38+0.375×5.4-37.5% =5.6×0.375+0.375×5.4-0.375=0.375×(5.6+5.4-1)=0.375×10=3.75 ⑤21-(37+13)×516=21...

(1)808×1.25,=(800+8)×1.25,=800×1.25+8×1.25,=1000+10,=1010;(2)8.6×[1÷(12.1-12.09)],=8.6×[1÷0.01],=8.6×100,=860;(3)815+(47?12)×1425,=815+114×1425,=815+125,=4375;(4)912×3.8+15×9.5,=912×(3.8+0.2),=912...

①(84×27-2166)÷17,=(2268-2166)÷17,=102÷17,=6;②115×3.7+5.3÷511+2.2,=2.2×3.7+5.3×2.2+2.2,=2.2×(3.7+5.3+1),=2.2×10,=22;③(0.75÷3-0.1)×(1-23),=(0.25-0.1)×13,=0.15×13,=0.05.

(1)13.6-2.8+7.4-7.2=(13.6+7.4)-(2.8+7.2)=21-10=11;(2)817÷23+123×917+123=(817+917+1)×123=2×123=223;(3)(12+13)÷35-1718 =56÷35-1718 =2518-1718=49;(4)(14-0.1÷2)×513+1213=(14-0.05)×513+1213=15×513+1213=113+121...

(1)15.02-6.8-1.02 =15.02-1.02-6.8=14-6.8=7.2(2)5.4×11-5.4=5.4×(11-1)=5.4×10=54(3)4.2×(6.18-3.03)=4.2×3.15=13.23(4)1.2÷[2.5×(4.3-2.7)]=1.2÷[2.5×1.6]=1.2÷4=0.3

(1)17.5÷12.5×1.4=1.4×1.4=1.96;(2)1.58×99+1.58=1.58×(99+1)=1.58×100=158;(3)4.38÷0.125÷0.8=4.38÷(0.125×0.8)=4.38×0.1=0.438;(4)6.4×4.5+3.6×4.5=(6.4+3.6)×4.5=10×4.5=45.

(1)(3.8-1.8÷2)×0.5 =(3.8-0.9)×0.5,=2.9×0.5,=1.45;(2)910÷[12×(65-310)]=910÷[12×910].=910÷920,=2;(3)25+37+35+47=(25+35)+(37+47),=1+1,=2;(4)19×15+15×14+17×20%=19×15+15×14+17×15,=(19+14+17)×15,=50×15...

①6.2+5.18+2.8=6.2+2.8+5.18=9+5.18=14.18②15.35-(5.35+7.2)=15.35-5.35-7.2=10-7.2=2.8③3.63-1.25+17.37-8.75=3.63+17.37-(1.25+8.75)=21-10=11④(450-125)×(82-64)=325×18=5850⑤(200+350)÷11×38 =550÷11×38=50×38=1900⑥720-(750÷15+...

(1)7.5×2.3+1.9×2.5=17.25+4.75=22;(2)(78.6-0.786×25十75%×21.4)×2011÷75,=(78.6-78.6×0.25+75%×21.4)×2011÷75,=[(1-0.25)×78.6+0.75×21.4]×2011÷75,=[0.75×78.6+0.75×21.4]×2011÷75,=(78.6+21.4)×0.75×2011÷75,=100×0.75×2...

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