1×3×24+2×6×48+3×9×72/(1×2×4+2×4×8+3×6×12)
1×3×24+2×6×48+3×9×72/(1×2×4+2×4×8+3×6×12)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20 =
1+2+3+4+5+6+7+8+9+10+11+12=?
1×2×4+2×4×8+3×6×12分之1×3×24+2×6×48+3×9×72=?简便算法!
计算1×2×4+2×4×8+3×6×12+…/1×3×9+2×6×18+3×9×27﹢…
求1×3+2×6+3×9+4×12+5×15/1×2+2×4+3×6+4×8+5×10
(1+3+7+…+1991)-(2+4+6+8+…+1990)=
(2+4+6+.+98+100)-(1+3+5+.+97+99)
12×3/8÷3/4 (1/4+2/9)×72 7/15+8/15×15 3-2/3÷4/5-1/6 (1/3+1/2)
(1/2×3)+(2/3×5)+(3/5×8)+(4/8×12)+(5/12×17)+(6/17×23)+(7/23×3
1+2-3+4+5-6+7+8-9+.+58+56-60等于几?
1.(2+4+6+.1984+1986+1988)-(1+3+5+.+1985+1987)=?