①61+178+39
②399-175+293
③265+378-194
④578-492-78
⑤136-64÷8
⑥297+3×7
⑦522-180-122
⑧58+155+345
①3.86+6.4+2.14+7.6
②5.2÷0.32﹣0.12
③()×15
④
⑤
⑥
①( ﹣ )×24
②0.36×99+0.36
③20.8﹣(9.6+0.125÷12.5%)
④( ﹣ ÷2)×
⑤2.5×16×12.5
⑥0.5÷[ ﹣( ﹣ )]