8+2﹣8+2             25×4÷25×4               ×5÷×5            26﹣0.75+0.25
7.26﹣（5.26﹣1.5）    286+198                 314﹣202           526+301
223﹣99              6.25+3.85﹣2.125+3.875    9﹣24÷56×21         98×58+58+58．