516÷5210 4870300487300 56×995600
84÷3840÷30 -8℃-1℃ 9℃7℃
①124×50 =
②(124÷2)×(25×2)=
③62×25=
①5.8﹣1.9﹣2.1
②×2.5××4
③÷(﹣)×
④83×0.75+17÷