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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

戳- -~~麻烦你出题目说清楚点~~...81又1/7...你给个空格干嘛... 81又1/7=568/7 71又1/6=427/6 61又1/5=306/5 51又1/4=205/4 41又1/3=124/3 先化完变成 568/7 * 7/8 +427/6 * 6/7+306/5 * 5/6+205/4 * 4/5+124/3 * 3/4 =568/8+427/7+306/6+205/5+...

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

51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5 =(50+5/3)×3/5+(70+7/4)×4/7+(90+9/5)×5/9 =50×3/5+5/3×3/4+70×4/7+7/4×4/7+90×5/9+9/5×5/9 =30+1+40+1+50+1 =123

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

1.25×3/4+1/4÷4/5 =1.25×3/4+1/4×1.25 =1.25×(3/4+1/4) =1.25×1 =1.25 应选D因为甲,乙两校的单位一不一样 1+3=4 1+3+5=9 1+3+5+7=16 1+3+5+7+9=25 注意观察,他们的结果,是有几位数,就是那个数的平方,比如:1+3=4,1和3有两个数,那就是2...

103 步骤如图

51又2/3*3/5+71又3/4*4/7+91又4/5*5/9 =(50+5/3)*3/5+(70+7/4)*4/7+(90+9/5)*5/9 =50 *3/5+5/3 *3/5+70 *4/7+7/4 *4/7+90 *5/9+9/5 *5/9 =30+40+50+1*3 =123

1-2-3+4-5-6-7+89=71 12+34+5-6+7+8-9=51

51又3分之2÷3分之5+71又4分之3÷4分之7+91又5分之4÷5分之9 =155/3x3/5+287/4x4/7+459/4x5/9 =31+41+51 =123

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