86+45= 370+130= 43-17= 284+455=
90-27= 324+74= 756-239= 498+303≈
980-72÷9= (436-388)÷8= 3×8+74= 507-291≈
9×8+147 302-6×7 (521-465)÷8
910﹣123+277
472﹣72÷8
(245﹣189)÷7
13+29= 42-36= 78-28= 520+300= 54÷6=
480-82= 64+25= 1000-9= 109-5×4= 5200-800=
综合算式:( )