700-(263+278) (491-483)×6
412+8×9 (554-505)÷7
9×8+147 302-6×7 (521-465)÷8
38+8×9= (28+72)÷2=
420÷6-25= 900-(125+265)=
800-124×6 732÷ (74-68) 58×7+485
①200-74+ 157
②55+45×6
③256-26×6
④100-48÷6
⑤5×(120-80)
⑥45÷(35÷7)
65-37+140 (357-294)÷9 765-(246+154)
综合算式:( )