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计算下面各题,注意使用简便方法 (3/4%2/3)÷1/5 (3...

能简便的用简便方法。(2/3一2/5)×(3/4÷4/5) =(2/3-2/5)*(3/4*5/4) =(2/3-2/5)*15/16 =2/3*15/16-2/5*15/16 =5/8-3/8 =2/8 =1/4

(1)2 3 4 -1.375+7.25-6 5 8 ,=2.75+7.25-(1.375+6.625),=10-8,=2;(2)888 8 9 ×1.125.=888×1.125+ 8 9 × 9 8 ,=999+1,=1000;(3)2000-1999×0.83-199.9×1.7.=2000-(1999×0.83+1999×0.17),=2000-1999×(0.83+0.17),=2000-19...

[(1.5+2+2/3)÷(3+3/4)-0.4]×(1+7/8) =[(25/6)÷(15/4)-0.4]×(1+7/8) =[(10/9)-(2/5)]×(15/8) =(32/45)×(15/8) =4/3

(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3=2.3+1.7=4(2)21.6÷[64.8-(48.6-2.7×2)]=21.6÷[64.8-(48.6-5.4)]=21.6÷[64.8-43.2]=21.6÷21.6=1(3)0.25×0.03×4 =(0.25×4)×0.03=1×0.03=0.030.13×3.89+0.13×5.11 =0.13×(3.89+5.11)=0.13×9=1....

1/3-(4/5-2/3)÷3/5 =1/3-(4/5-2/3)*5/3 =1/3-4/5*5/3+2/3*5/3 =1/3-4/3+10/9 =-1+1+1/9 =1/9

(1)0.75×99+0.75=0.75×(99+1),=75;(2)56-(23-16)=56+16-23,=13;(3)(8.5-4)×(0.32÷1.6)=4.5×0.2,=0.9;(4)56×[1÷(78?34)]=56×[1÷18],=56×8,=203;(5)0.925×17+9.25×8.3=9.25×1.7+9.25×8.3,=9.25×(1.7+8.3),=9.25×10...

应是分子与分母反了

(1)10.15-10.75×0.4-5.7,=10.15-4.3-5.7,=10.15-(4.3+5.7),=10.15-10,=0.15;(2)5.8×(3.87-0.13)+4.2×3.74,=5.8×3.74+4.2×3.74,=(5.8+4.2)×3.74,=10×3.74,=37.4;(3)32.52-(6+9.728)÷3.2×2.5,=32.52-15.728÷3.2×2.5,=3...

(1)0.25×8.75×4,=0.25×4×8.75,=100×8.75,=875;(2)25.8×7+3×25.8,=25.8×(7+3),=25.8×10,=258;(3)10÷0.2÷2.5,=10÷(0.2×2.5),=10÷0.5,=20;(4)21.36÷0.8-12.9,=26.7-12.9,=13.8.

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