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脱式计算(能简算要简算) (1)(662×1....

(1)3.4÷[(1.2+0.5)×5],=3.4÷[1.2×5+0.5×5],=3.4÷[6+2.5],=3.4÷8.5,=0.4;(2)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.

1、①6.54×1.2-1.87 =7.848-1.87 =5.978; ②86.4÷0.24+40 =360+40 =400; ③0.46×1.9+0.54×1.9 =1.9×(0.46+0.54) =1.9×1 =1.9; ④13.65÷0.25÷4 =13.65÷(0.25×4) =13.65÷1 =13.65. 2、其中③ ④可以用简便方法。 3、③的简便方法:乘法分配率:(...

(1)2.5×(1.9+1.9+1.9+1.9),=2.5×(1.9×4),=2.5×4×1.9,=10×1.9,=19;(2)19×99+99,=(19+1)×99,=20×99,=1980;(3)2.5×13×0.4,=(2.5×0.4)×13,=1×13,=13;(4)112÷(14+16),=112÷(312+212),=112÷512,=112×125,=15.

(1)2.5×1.37×0.4,=2.5×0.4×1.37,=1×1.37,=1.37;(2)4.8×0.25,=1.2×4×0.25,=1.2×(4×0.25),=1.2×1,=1.2;(3)0.89×4.8+0.89×5.2,=0.89×(4.8+5.2),=0.89×10,=8.9;(4)101×0.78,=(100+1)×0.78,=100×0.78+1×0.78,=78+0.78...

(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÷...

(1)0.95×27+57×0.95,=0.95×(27+57),=0.95;(2)519?1317?417+1419,=(519+1419)-(1317+417),=1-1,=0;(3)10000÷25÷8÷4,=10000÷(25×8×4),=10000÷800,=12.5;(4)59+79-1.625-2.375+3,=(59+79+3)-(1.625+2.375),=413-4...

7分之12—(7分之5+2分之1) =12/7-5/7-1/2 =7/7-1/2 =1-1/2 =1/2 [1—(4分之1+8分之3)]除以4分之1 =(1-1/4-3/8)x4 =1x4-1/4x4-3/8x4 =4-1-3/2 =3-3/2 =3/2 =1又1/2 8分之1 x 58+8分之1 x 42 =1/8x(58+42) =1/8x100 =100/8 =12又1/2 5分之4 x ...

(1)1.18×2.58+0.5+1.42×1.18=1.18×(2.58+1.42)+0.5=1.18×4+0.5=4.72+0.5=5.22;(2)(21.85-17.5)×(0.45÷0.9)=4.35×0.5=2.175;(3)1.75×(0.1÷0.2)-0.18÷0.9=1.75×0.5-0.2=0.875-0.2=0.675;(4)93.6÷[(54.8+45.2)×(6-5.46)]=93...

(1)25×7.6×0.8,=(25×0.8)×7.6,=20×7.6,=152;(2)23.7-3.9+6.3-6.1,=(23.7+6.3)-(3.9+6.1),=30-10,=20;(3)2.5×64×1.25,=2.5×(4×8×2)×1.25,=(2.5×4)×(1.25×8)×2,=10×10×2,=200;(4)1÷(1-0.98),=1÷0.02,=50;(...

(1)1.8×2.58+0.5+1.42×1.8=1.8×(2.58+1.42)+0.5=1.8×4+0.5=7.2+0.5=7.7;(2)(54.7-17.5)×(0.45÷0.9)=37.2×0.5=18.6;(3)1.5×(0.1÷0.2)-0.18÷0.36=1.5×0.5-0.5=0.75-0.5=0.25;(4)93.6÷[(54.8+45.2)×(6-5.46)]=93.6÷[100×0.5...

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