蜗牛每分钟爬行12.5厘米，如果要爬行76.25厘米，需要多少小时？
+= 1﹣=1÷=﹣=×= 0÷= 0.9+99×0.9=（+）×12=．
直接写出得数 1÷=+=÷=÷3=×=﹣=÷7=÷= 4×=÷8=×=÷=÷0.5= 5×=﹣=×0= 0.3×=÷=÷4=+0.5=
直接写得数：+= 1﹣= 1÷=﹣=×= 0÷= 0.9+99×0.9=（+）×12=
直接写出得数． （1）1﹣= 1÷=﹣=×= 0÷= （2）28×0.1= 1.3×3= 2.1×0.4= 5.4÷0.9= 10﹣9.99=
直接写出得数．+=﹣=÷= 1÷=×=××= 8×+8×= 55×÷=×÷×= 0×+=
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÷7=
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= 0.9+99×0.9=（
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﹣
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= 1÷
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×
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= 55×
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×
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= 0×
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