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(51/4一7/8 一7/12)÷(一|又3/4

(5又1/4-7/8-7/12)÷1又3/4 =(21/4-7/8-7/12)÷7/4 =(21/4-7/8-7/12)×4/7 =21/4×4/7-7/8×4/7-7/12×4/7 =3-1/2-1/3 =3-3/6-2/6 =2又6分之1

(-8)×25;(13)(-616)÷(-28);(14)-100-27;(15)(-1)101;(16)021...7/9-564.6-(-3/4+1.6-4-3/4)1/2+3+5/6-7/12[2/3-4-1/4*(...

解:﹙5.6×3×1.7×0.9﹚÷﹙51×0.14×4×18﹚ =﹙ 0.56÷0.14﹚×﹙3×17÷51﹚×﹙0.9÷18﹚÷4 =4×1÷4×0.05 =0.05 ﹙15/56-13/42+11/30-9/20+7/12-1/3﹚×2.005×390 =﹙1/7+1/8-1/6-1/7+1/5+1/6-1/4-1/5+1/+1/4-1/3﹚×2.005×390 =﹙1/...

8/17×51=51×8/17=24 7/12×20×9/35=7×20×9/(12×35)=3 11/42×7/33×3/4=11×7×3/(42×33×4)=1/24

1/3:1/5=1/3 ÷1/5=1/3*5=5/3 3/4:1/9 =3/4÷1/9=3/4*9=27/4 1/20:1/4 =1/20÷1/4=1/20*4=1/5 15:12=15÷12=5/4=1/25 17:51=17÷51=1/3 5.7:19=5.7÷19=0.3

1、一根铁丝用去的长度与剩下长度比是5:3,剩下长度是全长的几分之几。如果用去了1.5米,原来长度是多少? 2、某班语文及格率90%,数学率87%,语数全及格率...

5/12*49+51*7/12 =(5*49 + 51*7)* 1/12 = (245 + 357)* 1/12 = 602/12

(12×21×45×10.2)÷(15×4×0.7×51) =(12÷4)×(21÷0.7)×(45÷15)×(10.2÷51) =3×30×3×0.2 =54

51+(2304-2042)×23 4215+(4361-716)÷81 (247...3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 +...10. 3/4 × 8/9 - 1/3 11. 7 × 5/49 ...

(12×21×45×10.2)÷(15×4×0.7×51) =(12×21×3×10.2)÷(4×0.7×51) =(3×21×3×10.2)÷(0.7×51) =(3×30×3×10.2)÷51 =3×30×3×0.2 =54

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