1·25+3/4-12/5-8/3=?

1·25+3/4-12/5-8/3=? 1+2+3-4+5+6+7-8+9+10+11-12+···+25+26+27-28=? 解方程:6/x+2=3/7 4/3x-25%==33 4/3-0.25=12/5x是未知数·············· 1+2-3-4+5+6-7-8+9+10-11-12······-2003-2004+2005+2006-2007-2008+2009+2010=? 1+2+3+4+5+6+7+8+9+1+11+12+13+14+15````````1+2+3+4+5+6+7+8+9+1+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28++29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50·································· 1 2 9 10 25 26 ··· 4 3 8 11 24 27 ··· 5 6 7 12 23 26··· 17 1816 15 14 13 22 29···1 2 9 10 25 26 ··· 4 3 8 11 24 27 ··· 5 6 7 12 23 26···16 15 14 13 22 29·· ·17 18 19 20 21 30···36 35 34 33 32 31··· · 1*2*3+2*3*4+3*4*5+···+25*26*27+26*27*28=? 求求各位聪明人士,我想了好久喽,求求了·······1×3×5+2×6×10+3×9×15+4×12×20+5×15×25/1×2×3+2×4×6+3×6×9+4×8×12+5×10×15 （1+3+5++7+9······+2011）-（2+4+6+8······+2012）= 1=5 2=25 3=75 4=125 5=?··· 找规律的应用题有19个等式,如下表：1+2+3=4+5-36+7+8+9=10+11+12-313+14+15+16+17=18+19+20+21-322+23+24+25+26+27=28+29+30+31+32-334+35+36+37+38+39=40+41+42+43+44+45-3············那么,第19个等式左右两边的结果是多 1+2+3+4+5+6+7+8+9······+99=?1 2/1=10/5=0.5像这样的5/2 4/3 25/12 8/1 1+2+3+4+5+6+7+8+9+11+12+25+35+14+58+25*95= 1×2＋3×4+5×6+7×8······+199×200= 计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50= 1+2+3-4+5+6+7-8+······+29+30+31-32= 1-2+3-4+5-6+7-8+9······+2009-2010+2011=?