①102×4.5            

②7.8×6.9+2.2×6.9

③4×37×0.25          

④8×（20﹣1.25）

①12.5×1.8×0.8

②78÷0.25÷0.4

③0.6×2.5+0.4×2.5

④0.85×（21.9﹣7.6÷4）

2.5×(7.2×0.4 )={#blank#}1{#/blank#}×({#blank#}2{#/blank#}×{#blank#}3{#/blank#}) 8.8÷1.25÷0.8={#blank#}4{#/blank#}÷({#blank#}5{#/blank#}×{#blank#}6{#/blank#})

5.5×4.6+4.6×4.5=({#blank#}7{#/blank#}+{#blank#}8{#/blank#}) × {#blank#}9{#/blank#} 2.55×0.98={#blank#}10{#/blank#}×{#blank#}11{#/blank#} - {#blank#}12{#/blank#}×{#blank#}13{#/blank#}