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脱式计算,能简便计算的要简算. (1)13÷0.4÷...

(1)13÷0.4÷2.5=13÷(0.4×2.5)=13÷1=13(2)64×4.5+36×4.5=(64+36)×4.5=100×4.5=450(3)1.5×101-1.5=1.5×(101-1)=1.5×100=150(4)2.8×7.3+0.27×28=2.8×7.3+2.7×2.8=2.8×(7.3+2.7)=2.8×10=28

(1)130÷0.4÷2.5 =130÷(0.4×2.5)=130÷1=130(2)5.4×101=5.4×(100+1)=5.4×100+1×5.4=545.4(5)1.6×55.4-55.4×0.6=(1.6-0.6)×55.4=1×55.4=55.4(6)0.5×37×0.2=0.5×0.2×37=0.1×37=3.7

1、①6.54×1.2-1.87 =7.848-1.87 =5.978; ②86.4÷0.24+40 =360+40 =400; ③0.46×1.9+0.54×1.9 =1.9×(0.46+0.54) =1.9×1 =1.9; ④13.65÷0.25÷4 =13.65÷(0.25×4) =13.65÷1 =13.65. 2、其中③ ④可以用简便方法。 3、③的简便方法:乘法分配率:(...

8/13*1/7+1/7*6/13=1/7(8/13+6/13)=2/13

(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)8.5+1.5×2+1÷0.4=8.5+3+2.5 =(8.5+2.5)+3=11+3=14 (2)6.9×3.6-4.84÷0.4=24.84-12.1=12.74 (3)4.75+8.4÷(9.2-6.8)=4.75+8.4÷2.4=4.75+3.5=8.25(4)1.25×64=(1.25×8)×8=10×8=80 (5)1.9×2.34+1.9×7.66=1.9×(2.34+7.66)=1.9×10=19

(1)310+4.25+3.7+134=310+3.7+4.25+134=(310+3.7)+(4.25+134)=4+6=10;(2)0.125×3.2×25=0.125×8×0.4×25=(0.125×8)×(0.4×25)=1×10=10;(3)17×44+54×17=17×(44+54)=17×98=14;(4)7.8÷〔32×(1-58)+3.6〕=7.8÷〔32×38+3.6〕=7.8...

①42÷(5.25÷0.25)=42÷(5.25×4)=42÷21=2②0.4+12.6÷0.28×0.2=0.4+45×0.2=0.4+9=9.4③8.4-8.4×1.5÷1.8=8.4×(1- 5 6 )=8.4× 1 6 =1.4④0.27×99+0.27=0.27×(99+1)=0.27×100=27⑤2.5×3.2×0.125=2.5×(0.4×8)×0.125=(2.5×0.4)×(8×0.125)=1×1=...

(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...

(1)9.07-22.78÷1.7=9.07-13.4=-4.33(2)1.05÷0.7+18.9=1.5+18.9=20.4(3)21.5÷0.05×0.96=430×0.96=412.8(4)0.4×5÷0.4×5=0.4÷0.4×5×5=1×5×5=25(5)(7.5-2.3×0.4)÷0.01=(7.5-0.92)÷0.01=6.58÷0.01=658(6)10÷4÷12.5=10÷(4×12.5)=10÷...

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