3/4+1/4-3/4-1/4 (5/8+2/27)*8+11/27 36*(7/9+5/6)÷58 2/3*3/5-1
3/4+1/4-3/4-1/4 (5/8+2/27)*8+11/27 36*(7/9+5/6)÷58 2/3*3/5-1
(1×2×3×4×5×6×7×8×9×10×11)÷(27×25×24×22)怎样简算?
1+2+3-4+5+6+7-8+9+10+11-12+.+25+26+27-28
11*10*9*8*7*6*5*4*3*2*1/(22*24*25*27)
7/9*5/6/14/27 1/2*2/5+9/10/9/20 5/8*1/4/5/8*1/4 (1/2+2/3+3/4
3/7 × 49/9 - 4/3 8/9 × 15/36 + 1/27 12× 5/6 – 2/9 ×3 8× 5/4
(9+8+7+6+5+4+3+2+1)-(1+2+3+4+5+6+7+8+9)×58=?
24×(3/4+5/6-2/3) 1/8×7/11+4/11÷8 2/3÷[9/14×(5/6-4
1 +2-3+4+5-6+7+8-9+10+11-12.+58+59-60巧算
1+2-3-4+5+6-7-8+9+...+26-27-28+29=?
1+2+3-4+5+6+7-8+9+……+25+26+27-28=
1+2+3-4+5+6+7-8+9+10+11-12+.+25+26+27-28这条题用等差数列怎么做