①4.7+16.48+5.3+3.52
②56.8-27.4-12.6
③8900÷25÷4
④138×56-56×38
⑤78×99+78
15-4.8+9.06 8.2+7.92+22.8
89-15.73-23.27 27.9 -(19+7.9)
121+(682+79) 397﹣(45+197) 4×8×125×25 92×99+92