螃蟹有10条腿，螳螂有6条腿和1对翅膀，蜻蜓有6条腿和2对翅膀．现在这三种动物37只，共有250条腿和52对翅膀．每种动物各有多少只？
直接写得数 0.4+=×=÷= 25%×4=÷7= 3.14×32= 1﹣80%=××15=×= 3000×40%=
×=÷=×= 2×=÷=÷3=+=﹣=
直接写出得数 3×= ×= ×18= ×= = ÷= ÷= 3×= ．
直接写得数．========
12+9.9= 1÷0.25=÷=×50%=﹣=（0.75﹣）×96=
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×50%=
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