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2-1/2-(-3/4)+(-5/6)-2/3怎么解?求过程

2-1/2-(-3/4)+(-5/6)-2/3 =1又1/2+3/4+(-5/6-2/3) =2又1/4-1又1/2 =3/4

解: 6 又1/3+(-4.6)+(-2/5)-2.3-(-2/3) =6+1/3-4.6-0.4-2.3+2/3 =6+(1/3+2/3)-(4.6+0.4+2.3) =6+1-7.3 =7-7.3 =-0.3

4/5+2/3÷(5/6-1/2) =4/5+2/3÷(5/6-3/6) =4/5+2/3÷1/3 =4/5+2 =2又4/5

如图

为-50 第一种解法: 1-2+3-4+5-6+……+99-100 =(1-2)+(3-4)+(5-6)+……+(97-98)+(99-100) =(-1)X100/2=-50 解释:原100个数,因从第一项起每相邻两个数相加为-1,所以就变成(100个数/2)=50组数,即50个-1。所以为-50。 第二种解法: 用等差数列求...

解: 按从左向右的顺序依次进行计算 (-7又2/3)*(3/4)÷(-5/6)÷(-1/2) =(-23/3)*(3/4)*(-6/5)*(-2) =(-23/4)*(-6/5)*(-2) =(69/10)*(-2) =-69/5

解: 原式 =17又3/4-(5又5/6+9又2/3+3又1/2) =17又3/4-(5又10/12+9又8/12+3又6/12) =17又3/4-17又24/12 =17又3/4-19 =-1又1/4

(1/2-1/3-1/4+1/12)*(-24) =(1/2)*(-24)-(1/3)*(-24)-(1/4)*(-24)+(1/12)*(-24) =(-12)+8+6+(-2) =0 (-5/6)...

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