5.4×2.8＋4.6×2.8=({#blank#}1{#/blank#}＋{#blank#}2{#/blank#})×{#blank#}3{#/blank#}

4.35×1.6＋56.5×0.16

3.12×0.5＝{#blank#}1{#/blank#}×{#blank#}2{#/blank#}

12.5×8.7×0.8＝({#blank#}3{#/blank#}×{#blank#}4{#/blank#})×{#blank#}5{#/blank#}

(2.5＋0.6)×4＝{#blank#}6{#/blank#}×{#blank#}7{#/blank#}＋{#blank#}8{#/blank#}×{#blank#}9{#/blank#}

4.1×1.5＋5.9×1.5＝({#blank#}10{#/blank#}＋{#blank#}11{#/blank#})×{#blank#}12{#/blank#}

①8.57﹣22.78÷3.4

②0.75×2.8+0.75×7.2

③7.25÷0.25÷4

④0.8×0.9×12.5

⑤（3.2+1.48）÷1.8

⑥11.1÷0.3×1.02

                 ▲×▲。(填上合适的数，使计算简便)