1/2-1/3=1/6 1/3-1/4=1/12 .根据算式简算下面算式的和 1/6+1/12+1/20+1/30+1/42+1/56 等于?
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![1/2-1/3=1/6 1/3-1/4=1/12 .根据算式简算下面算式的和 1/6+1/12+1/20+1/30+1/42+1/56 等于?](/uploads/image/z/1691674-34-4.jpg?t=1%2F2-1%2F3%3D1%2F6+1%2F3-1%2F4%3D1%2F12+.%E6%A0%B9%E6%8D%AE%E7%AE%97%E5%BC%8F%E7%AE%80%E7%AE%97%E4%B8%8B%E9%9D%A2%E7%AE%97%E5%BC%8F%E7%9A%84%E5%92%8C+1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56+%E7%AD%89%E4%BA%8E%3F)
1/2-1/3=1/6 1/3-1/4=1/12 .根据算式简算下面算式的和 1/6+1/12+1/20+1/30+1/42+1/56 等于?
1/2-1/3=1/6 1/3-1/4=1/12 .根据算式简算下面算式的和 1/6+1/12+1/20+1/30+1/42+1/56 等于?
1/2-1/3=1/6 1/3-1/4=1/12 .根据算式简算下面算式的和 1/6+1/12+1/20+1/30+1/42+1/56 等于?
1/6+1/12+1/20+1/30+1/42+1/56
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8(中间的全抵消)
=1/2-1/8
=3/8
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)=====
1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=?
1/1*3+1/2*4+1/3*5+1/4*6+.+1/100*102=?
1-1/2+1/3-1/4+1/5-1/6+…+1/15=23*[1/( )+1/( )+1/( )+1/( )]
1/2+1/3+1/4+1/5+1/6+1/7+.1/20=
6/1{4/1[3/1(2/1x-1)+3]+5}=1 解方程
1/6【1/4{1/3(1/2X-1)+3}+5】=1
1/2{1/3[1/4(1/5x-1)-6+3}=1 解方程
1/2{1/3[1/4(5/1x-1)-6]+3}=1
(-3/4)+(-1/6)-(-1右-1/2)=多少?
1/4-1/5=1/18+1/6=1/2-1/8=7/11+5=1/3+1/4=2-1/3=
1/2{1/3[1/4(1/5x-1)-6]+4}=1
1.(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)=2.(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)=
2×3/1+3×4/1+4×5/1+5×6/1+.199×200/1=?
1/2+1/3+1/4=?
1/2-3/1-4/1=
因为1-2/1=2/1,2/1-3/1=6/1,3/1-4/1=12/1,所以2/1+6/1=1-2/1+2/1-3/1=1-3/1=3/2 2/1+6/1+12/1=1-2/1+2/1-3/1+3/1-4/1=1-4/1=4/3