①56÷(18-11)
②49+ 36÷9
③(99-78)÷3
④361-(137+168)
⑤700-286- 214
⑥165+ 135+166
⑦32+16÷ 8
①20+54-15
②56÷(18-11)
③49+36÷9
④4×(281-262)
⑤963-23×4
⑥650-(360-180)
①2.4÷×
②(+﹣)×36
③×99
④29.3﹣12.6﹣7.4
⑤5.9×8.5﹣49×0.85
⑥×[6÷(﹣)]
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1