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21/(4.8一0.5)用简便方法计算

4.8x0.21+0.52x2.1简便计算 4.8x0.21+0.52x2.1 =4.8*0.21+5.2*0.21 =0.21*(4.8+5.2) =0.21*10 =2.1

=840÷21÷0.5 =40÷0.5 =400÷5 =80

3/8x(1/3-8/21x0.5) =3/8x(1/3-4/21) =3/8x1/3-3/8×4/21 =1/8-1/14 =3/56

21.5÷0.5+1.5 =200÷5+15÷5+1.5 =40+3+1.5 =44.5

84÷0.21÷0.5 =84÷(0.3×0.7)÷0.5 =84÷0.3÷0.7÷0.5 =(84×1000)÷(0.3×10)÷(0.7×10)÷(0.5×10) =84000÷3÷7÷5 =28000÷7÷5 =4000÷5 =800

5.67*0.21-0.62 = 0.5707

小数乘除法计算题2010-02-07 09:24乘法: 5.6×2.9 3.77×1.8 0.02×96 5.22×0.3 9.99×0.02 4.67×0.9 5×2.44 1.666×6.1 9.432×0.002 5.6×6.5 4.88×2.9 5.61×4.3 8.9×2.4 5.5×55 9.77×0.02 1.384×5.1 8.78×83 2.6×61 0.059×0.2 4.268×1.7 57×5.7 9.4...

(1)2.8×7.6+1.4×2.8+2.8=2.8×(7.6+1.4+1)=2.8×10=28;(2)70.8-0.8×0.5=70.8-0.4=70.4;(3)13-3.79-6.21=13-(3.79+6.21)=13-10=3;(4)5×(40+0.7)=5×40+5×0.7=200+3.5=203.5;(5)4.12-1.78-1.22=4.12-(1.78+1.22)=4.12-3=1.12;...

(1)9.7-3.79+1.3-6.21,=9.7+1.3-(3.79+6.21),=11-10,=1;(2)280-49-156,=280-(49+156),=280-205,=75;(3)(4.8-2.8÷2)×0.5,=(4.8-1.4)×0.5,=3.4×0.5,=1.7;(4)32×12.5×0.25,=(8×12.5)×(4×0.25),=100×1,=100;(5...

(1)945÷(720-21×33),=945÷(720-693),=945÷27,=35;(2)9.05-11.3×0.6-1.22,=9.05-6.78-1.22,=9.05-(6.78+1.22),=9.05-8,=1.05;(3) 8 15 ÷23+ 1 23 × 7 15 ,= 8 15 × 1 23 + 1 23 × 7 25 ,=( 8 15 + 7 15 )× 1 23 ,=1× ...

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