数列:[1,2]=3,[1,2,3]=0,[1,2,3,4]=4,[1,2,3,4,5]=-1,[1,2,3,4,5,6]=5,[1,2,3,4,5,6,7]=-2,[1,2,3,4,5,6,7,8]
阅读下列材料:1×2=(1×2×3﹣0×1×2),2×3=(2×3×4﹣1×2×3),3×4=(3×4×..[99%]
阅读下列材料:1×2=(1×2×3﹣0×1×2),2×3=(2×3×4﹣1×2×3),3×4=(3×4×5﹣2×3×4),由以上三个等式相加,可得:1×2+2×3+3×4=×3×4×5=20.读完以上材...
数列:[1,2]=3,[1,2,3]=0,[1,2,3,4]=4,[1,2,3,4,5]=-1[99%]
数列:[1,2]=3,[1,2,3]=0,[1,2,3,4]=4,[1,2,3,4,5]=-1,[1,2,3,4,5,6]=5,[1,2,3,4,5,6,7]=-2,[1,2,3,4,5,6,7,8]
﹙﹙1+1/2+1/3+1/4﹚×﹙1/2+1/3+1/4+1/5﹚-﹙1+1/2+1/3+1/4+1/5)×﹙﹙1/2+1/3+1/4﹚的值是...[99%]
﹙﹙1+1/2+1/3+1/4﹚×﹙1/2+1/3+1/4+1/5﹚-﹙1+1/2+1/3+1/4+1/5)×﹙﹙1/2+1/3+1/4﹚的值是( )。
阅读下列材料:1×2=×(1×2×3-0×1×2),2×3=×(2×3×4-1×2×3),3×4=×(3..[99%]
阅读下列材料:1×2 = ×(1×2×3-0×1×2),2×3 = ×(2×3×4-1×2×3),3×4 = ×(3×4×5-2×3×4),由以上三个等式相加,可得1×2+2×3+3×4 = ×3×4×5 = 20。读完以上...
﹙﹙1+1/2+1/3+1/4﹚×﹙1/2+1/3+1/4+1/5﹚-﹙1+1/2+1/3+1/4+1/5)×﹙﹙1/2+1/3+1/4﹚的值是...[99%]
﹙﹙1+1/2+1/3+1/4﹚×﹙1/2+1/3+1/4+1/5﹚-﹙1+1/2+1/3+1/4+1/5)×﹙﹙1/2+1/3+1/4﹚的值是( )。 
A. 1/2
B. 1/3
C. 1/4...
﹙﹙1+1/2+1/3+1/4﹚×﹙1/2+1/3+1/4+1/5﹚-﹙1+1/2+1/3+1/4+1/5)×﹙﹙1/2+1/3+1/4﹚的值是...[99%]
﹙﹙1+1/2+1/3+1/4﹚×﹙1/2+1/3+1/4+1/5﹚-﹙1+1/2+1/3+1/4+1/5)×﹙﹙1/2+1/3+1/4﹚的值是( )。 
A. 1/2
B. 1/3
C. 1/4...
1+2+3=2×()=()1+2+3+4+5=3×()=()1+2+3+4+5+6+7=4×()=()1+2+3+4+5..[99%]
1+2+3=2×()=()1+2+3+4+5=3×()=()1+2+3+4+5+6+7= 4×()=()1+2+3+4+5+6+7+8+9=()×()=()
(1)出售 (2)施肥(3)翻土 (4)播种(5)收割A.5-2-1-4-3 B.5-3-1-4-2C.3-4-2-5-1 D.3-1-5-2-4[99%]
(1)出售 (2)施肥
(3)翻土 (4)播种
(5)收割
A.5-2-1-4-3 B.5-3-1-4-2
C.3-4-2-5-1 D.3-1-5-2-4
(1)运动 (2)医院(3)发病 (4)急救(5)缓解A.5-1-4-2-3 B.1-3-2-4-5C.5-1-2-4-3 D.1-4-2-5-3[99%]
(1)运动 (2)医院
(3)发病 (4)急救
(5)缓解
A.5-1-4-2-3 B.1-3-2-4-5
C.5-1-2-4-3 D.1-4-2-5-3