① ②
③ ④
2x+5.4=18.9 2x-2.8=9.96 (x-0.8)×4=7.2
①9.07﹣22.78÷3.4
②0.5×99+0.5
③2.6×(93÷9.3×6.2)
④6.9÷0.125×0.8
①2﹣﹣﹣
②0.8++0.2
③15﹣5÷12﹣
④68﹣7.5+32﹣2.5
⑤﹣(﹣)
× × 0.01