①28.4×99+28.4
②3.6×201
③0.25×(4+0.4)+0.9
④4×0.8×12.5×2.5
⑤4.8÷1.25÷0.8
①
②
③
④
③12.5×0.32×2.5
④5÷+÷5
⑤18×()×14
⑥4.5×26+45×7.4