根据运算顺序添上小括号或中括号32×800﹣400÷25 先减再乘最后除．
直接写出得数．+=﹣=+=﹣=+= 1﹣=﹣=+=
脱式运算，能简便的要用简便方法计算．﹣++++ 1﹣﹣．
直接写出的数+=﹣=+ 880÷8= 19×5= 36÷3÷2= 5×5+4= 50﹣24÷4= 300×30= 88+112=
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直接写出得数．==========
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880÷8= 19×5=
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