ldcf.net
当前位置:首页 >> 脱式计算(能用简便方法的用简便方法计算)2.5×(6... >>

脱式计算(能用简便方法的用简便方法计算)2.5×(6...

(1)2.5×(6+9.728÷3.2)=2.5×(6+3.04)=2.5×9.04=22.6(2)45×7.3+27×4.5=45×(7.3+2.7)=45×10=450(3)0.125×3.2×25=0.125×8×0.4×25 =(0.125×8)×(0.4×25)=1×10=10(4)[8.3-(3.6+2.9)]÷0.72=[8.3-6.5]÷0.72=1.8÷0.72=2.5(5)(140+0...

(1)2.5×(6+5×3.2)=2.5×(6+16)=2.5×22=55;(2)45×7.3+27×4.5=45×7.3+2.7×45=45×(7.3+2.7)=45×10=450; (3)5.8×101-5.8=5.8×(101-1)=5.8×100=580;(4)0.125×3.2×25=0.125×(8×0.4)×25=(0.125×8)×(0.4×25)=1×10=10;(5)[8.3...

(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...

(1)13.6×3-40.6÷2,=40.8-20.3,=20.5;(2) 99×0.75+ 1 4 ×99 ,=99×(0.75+0.25),=99×1,=99;(3) ( 5 6 - 5 8 )×24 ,= 5 6 ×24- 5 8 ×24,=20-15,=5;(4) 121×100 1 121 ,=121×(100+ 1 121 ),=121×100+121× 1 121 ,=12100+1...

2.6*(5.3+4.7)=26

(1)0.389×4×0.25,=0.389×(4×0.25),=0.389×1,=0.389;(2)4.02×3.02+4.02×6.98,=4.02×(3.02+6.98),=4.02×10,=40.2;(3)4.05÷0.81+2.4,=5+2.4,=7.4;(4)65.4÷2.5÷4,=65.4÷(2.5×4),=65.4÷10,=6.54;(5)86×9.9,=86×(10...

(1)0.6×(3.6-2.4)=0.6×1.2=0.72(2)400÷25÷8+5×8=400÷(25×8)+40=400÷200+40=2+40=42(3)8×317÷[1÷(315-2.95)]=8×317÷[1÷(315-21920)]=8×317÷(1÷14)=8×317÷4=8×317×14=627(4)12.5×0.75-2.5×34+0.75=0.75×(12.5-2.5+1)=0.75×11=...

①52.32-(6+3.06)×1.5=52.32-9.06×1.5=52.32-13.59 =38.73 ②72.6×0.3+0.3×27.4=0.3×(72.6+27.4)=0.3×100=30③[3.8-(1.26+0.34)]×0.45=(3.8-1.6)×0.45=2.2×0.45=0.99 ④11.79+7.65×2.4+10.64=11.79+18.36+10.64=11.79+29=40.79

(1)4.5×5.2+4.5×4.8=4.5×(5.2+4.8)=4.5×10=45;(2)8.8×1.25=(8+0.8)×1.25=8×1.25+0.8×1.25=10+1=11;(3)0.4×(4.3×2.5)=4.3×(0.4×2.5)=4.3×1=4.3;(4)60.8-1.75-1.25=60.8-(1.75+1.25)=60.8-3=57.8;(5)0.4×(4.3×2.5)=4.3×...

1、3/8÷1/4+6×3/4=3/8×4+6×3/4=3/2+9/2=6 2、5/12×﹙3/5+4/5÷2/3﹚=5/12×﹙3/5+4/5×3/2﹚=5/12×﹙3/5+6/5﹚=5/12×3/5×﹙1+2﹚ =5/12×3/5×3=3/4,等于4分之3 3、13/14-15/28÷5/8+1/4=13/14-15/28×8/5+1/4=13/14-2/7+1/4=...

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com