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17.5%(9.8 4.5)简便运算

1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 × 5/6 + 5/6 10. 3/4 × 8/9 - 1/3 11. 7 × 5/49 + 3/14...

1/6 * 35 + 5/6 * 17 =3/4 * 13 + 3/4 * 27 =3/4 *(13+27) =3/4 * 40 =30 55 * 55/56 =(56-1) * 55/56 = 56 * 55/56 - 55/56 =55- 55/56 =54又1/56 2又4/5 * 3/7 + 3/5 * 1/7 = 2又4/5 * 3/7+ 1/5 * 3/7 =3/7 * (2又4/5 + 1/5) =3/7 * 3 =...

(17又9分之1+17又9分之7)×12.5% =34 8/9 × 12.5% =34 8/9 × 1/8 =34 × 1/8 + 8/9 × 1/8 =17/4 + 1/9 =4 1/36 + 4/36 =4 5/36

(1)5.48+8.73+4.52+1.27,=(5.48+4.52)+(8.73+1.27),=10+10,=20;(2)0.4×1.25×25×8,=(0.4×25)×(1.25×8),=10×10,=100;(3)17.5-4.25-5.75,=17.5-(4.25+5.75),=17.5-10,=7.5;(4)276×27÷27.6,=276÷27.6×27,=10×27,=2...

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