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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)1.25×2.5×0.8,=1.25×0.8×2.5,=1×2.5,=2.5;(4)1.5×101-1.5,=1.5×(101-1),=1.5×100,=150;(5)14.64+3.7×2.8,=14.64+10....

(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)8×0.4×1.25×2.5,=(8×1.25)×(0.4×2.5),=10×1,=10;(2)72×99,=72×(100-1),=7200-72,=7128;(3)24×(13-18),=24×13-24×18,=8-3,=5;(4)27.4-52.8÷(1.9+2.1),=27.4-52.8÷4,=27.4-13.2,=14.2.

(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)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÷...

脱式计算能简算的要简算 0.25x32x12.5 =(0.25×4)×(8×12.5) =1×100 =100 2/5x68+0.4x32 =0.4×(68+32) =0.4×100 =40 14/5÷(14/5+7/10) =14/5÷7/2 =4/5 (2/3+4/15x5/6)÷10/21 =(2/3+2/9)÷10/21 =8/9÷10/21 =28/15 1-5/8÷25/28-3/10 =1-...

(1)17.64÷4.9+6.73=3.6+6.73,=10.33;(2)3.4÷[(1.2+0.5)×5]=3.4÷[1.7×5],=3.4÷1.7÷5,=2÷5,=0.4;(3)1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1,=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),=2+20+200,=222;(4)0.25×12.5×3....

(1)8.6×10.1=8.6×(10+0.1)=8.6×10+8.6×0.1=86+0.86=86.86;(2)9.07-22.78÷3.4=9.07-6.7=2.37;(3)5.6×(12.5-8.5÷0.85)=5.6×(12.5-10)=5.6×2.5=14;(4)150÷2.5+150÷7.5=60+20=80;(5)[(8.1-5.6)×0.9-1]×0.4=[2.5×0.9-1]×0.4=[2...

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

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