综合算试,简算300道 乘除法80道,要有小数点啊 越快越好,

2.2+3+0.72 7.7+2+9.1 1.5+5+2 7+0.1+0.151+6+2.7 8.3+2.2+2.8 8+2.5+1.2 5+0.3+1.85.8-4.8-0.2 2-1.2-0.5 8-3.7-2.5 5.5-2.8-2.76.8-5.7-0.3 7.9-5.4-2 4.5-2.1-1.9 9-2.5-1.22.3-1.5+5.6 5-3.2+8.5 1.5-0.1+6 8-2....