(1+1*2)-(2+5*6)+(3+1*12)-(4+19*20)+(5+1*30)-(6+41*42)+(7+1*56)-(8+71*72)+(9+1*90)
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(1+1*2)-(2+5*6)+(3+1*12)-(4+19*20)+(5+1*30)-(6+41*42)+(7+1*56)-(8+71*72)+(9+1*90)(1+1*2)-(2+5*6)+(3+
(1+1*2)-(2+5*6)+(3+1*12)-(4+19*20)+(5+1*30)-(6+41*42)+(7+1*56)-(8+71*72)+(9+1*90)
(1+1*2)-(2+5*6)+(3+1*12)-(4+19*20)+(5+1*30)-(6+41*42)+(7+1*56)-(8+71*72)+(9+1*90)
(1+1*2)-(2+5*6)+(3+1*12)-(4+19*20)+(5+1*30)-(6+41*42)+(7+1*56)-(8+71*72)+(9+1*90)
原式=1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1+(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/9-1/10)
=2-1/10=19/10(或者1.9)
49.5403
1 2 3 5 6
数独六宫格 ++++1+ 2+3+++ +++5+6 ++5+++ 6++++2 ++++1+
简算:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6
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)=====
1/6、1/3、1/2( )、5/6、1.
1/6,1/3,1/2,(),5/6,()探索规律,
6/1 3/1 2/1 ( ) 6/5 ( ); / 等于除号
1+1+1+1+1-5+5-5+1+1-2+3+3+3+3-6-3-3等于多少?
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+2+3+1+2+3-4+5+6
计算(+5/2)-(-5/3)=-5/1(-5/2)-(-5/3)=5/12/1-3/1=6/1(-2/1)-3/1=-6/1
1+1+1+1+1+1+1+1+1+2+5+4+8+3+6+2+1+4等于多少?
1*1/2+1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6+1/6*1/7用简便方法怎么做?
3/2x+1-6/5x-1=1
3/2x+1-6/5x-1=1
2x-1/3-1-5x/6=1
5x+1/3-2x-1/6=1