1.2/(1*3)+2/(3*5)+2/(5*7)+2/(9*11)2.1/(1*3)+1/(3*5)+1/(5*7)+……+1/(97*99)3.1-(5/6)+(7/12)-(9/20)+(11/30)-(13/42)+(15/56)-(17/72)+(79/90)4.(88888888*88888888)/(1+2+3+4+5+6+7+8+7+6+5+4+3+2+1)5.(1234+4567*7890)/4568*7890-6656
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3+2-5+1.2
(1+1.2)+(2+1.2×2)+(5+1.2×3)+.(100+1.2×100)
(1+1*1.2)+(2+2*1.2)+(3+3*1.2)+.+(100+1*10.2)
5x-3=3x-1+2-2x=1.2-2.7x
计算{-3/4}*{-8+2/3-4/3}和{-1.2}*{-5/8}+{-24}*1/12
(1+1.2x1)+(2+1.2x2)+(3+1.2x3)+.+(100+1.2x100)
1+(1*1.2)+2+(2*1.2)+3+(3*1.2)+...+99+(99*1.2)=?简算
是初一一元一次方程的问题?a-1=5+2a0.3X+1.2-2X=1.2-2.7x
用简便方法计算 (1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)=
1.2+1.2^2+1.2^3+ +1.2^20=
0.9+(9x-3/5)-6=(1-2x)-2-1.2x
12-2/7-5/7和1/5-1.2*(3/4-7/12 )的简算
相信你能行(巧算,1 (22944-22.944)%(45888-45.888)2 (1+1.2)+(2+1.2*2)+(3+1.2*3)+...+(99+1.2*99)+(100+1.2*100)
计算9/5[5/9(1/2x-1/3)-7]-3/2x=2 (3x-1.8)/0.6-(2x-0.8)/0.4=(1.2-x)/0.3
1,x-1/4x=3/8 2,5/x:1.5/1.2.解方程
1.2:4/5 1.75/0.35 1/20:1/4 2/3时:70分化简一上各比
1/3:1/4、4/3:1.6化简比,8/5:8/3、1.2:2又1/4、6/5:3/4、8/9:2求比值,
x-9/6-x+2/3=x-1 x/5-1.5=-1.2x+5 3(5-1.2x)+1.4=x-9/6-x+2/3=x-1x/5-1.5=-1.2x+53(5-1.2x)+1.4=-2(0.3x-1)1-x=-2(3x-2)-12/3x-3/2=1/4x-3/4(6x-5)+[2x-(4x-1)]=-24