2.4+5.7{#blank#}1{#/blank#}5.7+2.4       52.1+72.1-43.65{#blank#}2{#/blank#}43.65+(72.1-52.1)

12.34-2.9{#blank#}3{#/blank#}5.73+4.1    35.6+4.6+7.01{#blank#}4{#/blank#}35.6+4.4+7.21

{#blank#}1{#/blank#}+{#blank#}2{#/blank#}+{#blank#}3{#/blank#}+{#blank#}4{#/blank#}

=(8.9+{#blank#}5{#/blank#})+(3.6+{#blank#}6{#/blank#})

={#blank#}7{#/blank#}+{#blank#}8{#/blank#}

={#blank#}9{#/blank#}(元)

①25×32×125

②4.2-1.38+5.8-4.62

③

④69×101-69

⑤0.8×5.6-0.8×0.6

⑥

①22.36+25.82+77.64-15.82

②22.8×98+45.6

③4.58×25.1+45.8×6.35+0.458×114

④63÷3.7+11÷3.7

⑤41.2×8.1+11×1.25+53.7×1.9

⑥4.8×7.8+78×0.52

⑦99×86.2+86.2

⑧999.9×0.28-0.6666×370

⑨23.56-(2.017-0.44)+2.017

⑩0.25×0.2×16×1.25