×125××8              ++×24                      ×（﹣）÷
3÷+3÷                7+8.9+2+6.1                  0.36×101
20﹣（5.6+4.8）÷1.3         3.2×（2.15+1.95÷6.5）       （+）÷+
36×（+﹣）