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17.5%(9.8 4.5)简便运算

(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

这样子

1)1.25*17.6+36.1/0.8+2.36*12.5 1.25*17.6+36.1/0.8+2.36*12.5 =(5/4)*17.6+36.1*(5/4)+23.6*(50/4) =176/8+361/8+236/8 =773/8=96.625 (2)7.5*2.3+1.9*2.5 7.5*2.3+1.9*2.5 =7.5*(1.9+0.4)+1.9*2.5 =(7.5+2.5)*1.9+7.5*0.4 =19+3 =22 (3)...

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*3/8+62.5%*17=17(3/8+62.5%)=17 62.5%=5/8 4/15÷5/12×5/9=4/15*12/5*5/9=16/45

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