3,4,5
3 3 5 5 5 4 4 5 4 4
3 4 5
3,4,5,
4-3=5?
3,4,5题
3,4,5
{3/4+4/5+5/6}+{1+2/3+3/4+4/5}-{1+2/3+3/4+4/5+5/6}×{2/3+3/4+4
(1)(1+2/3+3/4+4/5+5/6)*(1+3/4+4/5)-(1+3/4+4/5)*(2/3+3/4+4/5+
3/4*1/5+3/4*2/5+0.75*3/5-3/4简便运算
3/4×1/5+3/4×2/5+0.75×3/5-3/4
4/3*5/1+4/3*5/2+0.75*5/3-4/3简便计算
5/1*2*3+5/2*3*4+5/3*4*5+.+5/11*12*13