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(51/4一7/8 一7/12)÷(一|又3/4

数学题简便计算 51又2/3÷1又2/3+71又3/4÷1又3/4 =(50+5/3)×3/5+(70+7/4)×4/7 =50×3/5+5/3×3/5+70×4/7+7/4×4/7 =30+1+40+1 =72

馈线和频率是没有直接关系的!就像电线一样!到底走50赫兹的电流还是60赫兹的电流和电线无关! 功能的区别就是1/2馈线(又称1/2跳线)和7/8馈线粗细不同!而且由于7/8馈线太硬,不好打弯,所以很难用于室内走线,全部用于室外,但1/2跳线较软,...

4/3+7/5+2/1=20/15+21/15+30/15=71/15 转化分母相同 分子相加即可!小数转化分数

6*(12分之5+15分之4-2分之1) =6*5/12+6*4/15-6*1/2 =5/2+8/5-3 =25/10+16/10-30/10 =41/10-30/10 =11/10 (8分之1+4分之3)*(1-3分之1) =(1/8+6/8)*2/3 =7/8*2/3 =7/12 743-92*51/23 =743-4*51 =743-204 =539 3/[(4分之3+(5分之4-5分之1))] =3/(...

1/【(1/4-0.05)*5/8】 =1/【0.2*5/8】 =1/(1/8) =8 【3/4÷(1/4+5/8)】÷(1-1/2) =6/7÷1/2 =12/7 【2-(5/3-1.5)*12/17】÷8/51 =(2-(5/3-1.5)*12/17)/(8/51) = 12

31又1/2*2/3+41又1/3*3/4+51又1/4*4/5+61又1/5*5/6+71又1/6*6/7 =(30 + 3/2)*2/3+(40+4/3)*3/4+(50+ 5/4)*4/5+(60+6/5)*5/6+(70+7/6)*6/7 =20+1+30+1+40+1+50+1+60+1 =20+30+50+40+60+5 =205

81/10 规律 3/2= 9/6 分子 3的n次方-1 分母 2n

分子=1-1/2+1/3-1/4......+1/49-1/50 =1-1/2+1/3-1/4......+1/49-1/50+(1/2+1/4+1/6+......+1/50)-(1/2+1/4+1/6+......+1/50) =1+1/2+1/3+1/4......+1/49+1/50-2*(1/2+1/4+1/6+......+1/50) =(1+1/2+1/3+1/4+1/25)+1/26......+1/49+1/50-(1+1/2+...

(-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*(...

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