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21/(4.8一0.5)用简便方法计算

21.5÷(4.8-0.5) =21.5÷4.3 =21.5×2÷4.3÷2 =43÷4.3÷2 =10÷2 =5

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

=840÷21÷0.5 =40÷0.5 =400÷5 =80

21.6+8.2*0.5+21.6 =21.6+21.6+4.1 =43.2+4.1 =47.3

5.67*0.21-0.62 = 0.5707

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

(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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