请选择合适的方法计算下面各题．1﹣﹣ ﹣+ ++ ﹣﹣ +﹣．
直接写出得数：①= ②= ③= ④=⑤= ⑥= ⑦= ⑧=
直接写得数．+= += += ﹣= +=0.4+= ﹣= ﹣= += +=
直接写出得数．= 5﹣= = 0.5×0.5÷5= =﹣= = 0.4×25﹣10= = ﹣=1+= =
直接写出得数：+= ﹣= 0.2+1.8= 0.9﹣0.27=1.9×4×0.5= ﹣×= +++= 12.56÷3.14=
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= ②
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= 5﹣
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= 0.5×0.5÷5= 
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= 0.4×25﹣10= 
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= 12.56÷3.14=
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