1+2-3+5-6+7+8+2×6+12-18=?
3/8+13/18= 5/6+8/9= 2/7+1/3= 7/12-3/8=
1+2-3+5-6+7+8+2×6+12-18=?
5/6+2/9+7/18 11/12-(3/8-1/12) 2/3-1/4-1/6 7/11-1/5+8/11-4/5
M=-2,-3,-8,6,7 N=-3,-5,1,2,6
1+2+3+4+5+6+7+8+9+10+12+14+16+18+20=?
简便运算:5/6-(3/4-1/2) 2/5+2/3-2/5 2/15+(1/2+8/15) 11/18-7/12+7/
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22=?
7x-12(5/3 x-1/2)=8-2/3(6x-9) 解方程
1+2+3+4+5+6+7+8+9+12
2/3-1/6 3/4+1/8 6/7+7/9-6/7+7/9 7/18*36-7/18 1/6÷(5/12-1/24)
{}+{}={}{}—{}={} {}*{}={} 1,2,3,4,5,6,7,8,9,0.
简算:2/3+6/7-2/3+6/7 1/12+3/8+(5/8+5/12)