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21/(4.8一0.5)用简便方法计算

=840÷21÷0.5 =40÷0.5 =400÷5 =80

84÷0.21÷0.5 = 84÷21x100÷5x10 =4x20x10=800

原式 =101x0.2-0.2x21 =(101-21)x0.2 =80x0.2 =16 或者 =101x1/5-1/5x21 =(101-21)x1/5 =80x1/5 =80÷5 =16 供参考。

(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)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)815÷23+123×715,=815×123+123×725,=(815+715)×123,=1×123,=123;(4)1427÷[89×(12-38...

5.67*0.21-0.62 = 0.5707

(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...

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

80

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