(-2/3)+(-1/6)+1/4-1/2
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(-2/3)+(-1/6)+1/4-1/2
(-2/3)+(-1/6)+1/4-1/2
(-2/3)+(-1/6)+1/4-1/2
原式
=-8/12-2/12+3/12-6/12
=(-8-2+3-6)/12
=-13/12
(-2/3)+(-1/6)+1/4-1/2 = -13/12
1+2+3/6+1/4=
巧算:(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=====
(1- 1/100)(1- 1/99) .....(1- 1/4)(1- 1/3)(1- 1/2) (-1 1/2)*(-1 1/3)*......(-1 1/6)*(-1 1/7)
简算:24×(1/2+1/3-1/4-1/6)
(1/2+1/3+1/4+1/6)*24
简算:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6
1、2、2、4、3、6、4、( )、(
1+1+1+1+11+-1-1-1-1-2-3-4-5-6等于
1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=?
1+1+1+1+1+1+1+1+1+2+5+4+8+3+6+2+1+4等于多少?
1+1 1+3 6-3 4-2
1/1*3+1/2*4+1/3*5+1/4*6+.+1/100*102=?
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
(-2/3)+(-1/6)+1/4-1/2
习题2.8 -2/3+(-1/6)-(-1/4)-1/2
-1/2+(-1/6)-(-1/4)-2/3