足球：25元篮球：36元排球：18元 皮球：15元（1）买4个足球共花多少钱？（2）小明只带80元钱，可以买哪些球？
直接写得数．+=+=﹣=+= 1﹣+= 1﹣=﹣= 1﹣﹣= 4﹣﹣= 5﹣﹣=
直接写出得数．+=+=﹣= 15﹣=
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口算高速直达.+=+= 0.32=+2=+﹣+=﹣0.25=+= 12.5×8= 2﹣﹣=﹣+=
直接写出得数．+= 1﹣= 0.32= 1﹣+=+= 5﹣=﹣= 0.75+=
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=
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﹣
= 15﹣
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+
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= 0.32=
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﹣
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﹣0.25=
+
= 12.5×8= 2﹣
﹣
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+
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+
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