24×32= 12×16= 24×160=
(455÷5)÷(35÷5)= (455×4)÷35= 455÷(35÷5)=
(68+139)×40
2790-43×60
35×16-570÷30
(本)
①8×2.5×0.125÷
②(+﹣)×24
③6.5÷×
④(+)×+
⑤4×(﹣)×9
⑥÷7+×