www.whkt.net > 用递等式计算,能简算的要写出简算过程. (2.5×6+2.5×4)÷5 35.6%2.8+4...

用递等式计算,能简算的要写出简算过程. (2.5×6+2.5×4)÷5 35.6%2.8+4...

(1)(2.5*6+2.5*4)÷5,=2.5*(6+4)÷5,=2.5*10÷5,=25÷5,=5;(2)35.6-2.8+4.4-7.2,=(35.6+4.4)-(2.8+7.2),=40-10,=30;(3)0.25*3.2*12.5,=0.25*4*0.8*12.5,=(0.25*4)*(0.8*12.5),=1*10,=10;(4)7.5÷(1.5+2.5),=7.5÷4,=1.875;(5)0.6*(5+0.6)-1,=0.6*5+0.6*0.6-1,=3+0.36-1,=3.36-1,=2.36;(6)3.7*1.25-3.7*0.25,=3.7*(1.25-0.25),=3.7*1,=3.7.

2.5*(6+9.728÷3.2)=2.5*(6+3.04)=2.5*9.04=22.135.6-1.8+4.4-7.2=(35.6+4.4)-(1.8+7.2)=40-10=300.25*3.2*12.5=(0.25*0.4)*(8*12.5)=0.1*100=1013.7*0.25-3.7÷4=3.425-0.925=2.5

(1)7.8÷2.6+2.7*1.5=3+4.05=7.05;(2)35.6-5*1.7=35.6-8.5=27.1;(3)55.4*1.6-55.4*0.6=55.4*(1.6-0.6)=55.4*1=55.4;(4)21÷2.5÷0.4=21÷(2.5*0.4)=21÷1=21;(5)6.33*101-6.33=6.33*(101-1)=6.33*100=633;(6)(1.1-0.78)*(2.7-1.95)=0.32*0.75=0.24.

(1)1.25*3.2*0.25,=1.25*8*0.4*0.25,=(1.25*8)*(0.4*0.25),=10*0.1,=1;(2)6.4*0.27+3.6*0.27,=(6.4+3.6)*0.27,=10*0.27,=2.7;(3)3.84-0.84*5÷1.5,=3.84-4.2÷1.5,=3.84-2.8,=1.04;(4)2.5*0.99,=2.5*(1-0.01),=2.5*1-2.5*0.01,=2.5-0.025,=2.475;(5)8.19+0.

3/4÷6/5+3/4÷6 =3/4*5/6+3/4*1/6 =3/4*5/6+1/6 =3/4*1 =3/42又1/4÷10÷5/9 =9/4÷10*9/5 =9/4÷18 =9/4*1/18 =1/8,这道不简算

(1)4 1 5 -2 3 4 + 5 12 ,=4 12 60 -2 36 60 + 25 60 ,=(4 12 60 + 25 60 )-2 36 60 ,=5 37 60 -2 36 60 ,=3 1 60 ;(2)9999*36+6666*96,=3333*3*36+3333*2*96,=3333*108+3333*192,=3333*(108+192),=3333*300,=999900;(3)12 2 5 -2 2

(1) 1 6 * 2 3 ÷( 13 15 - 4 5 ),= 1 6 * 2 3 ÷ 1 15 ,= 1 9 ÷ 1 15 ,=1 2 3 ;(2)25%÷(3- 5 13 - 8 13 ),=25%÷[3-( 5 13 + 8 13 )],=25%÷[3-1],=25%÷2,= 1 8 ;(3)2.42 ÷ 4 3 +4.58* 3 4 +3÷4,=2.42* 3 4 +4.58* 3 4 + 3 4 ,=(2.42+4.58+1)* 3 4 ,=8* 3 4 ,=6.

(1)5.03-2.5+0.96,=2.53+0.96,=3.49;(2)35.72-(5.9+5.72),=35.72-5.9-5.72,=35.72-5.72-5.9,=30-5.9,=24.1;(3)25-4.7+5.3,=20.3+5.3,=25.6;(4)1.3+2.83+8.7+0.17,=(1.3+8.7)+(2.83+0.17),=10+3,=13;(5)2.47-2.2-3.8+7.53,=(2.47+7.53)-(2.2+2.8),=10-5,=5.

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