问题
填空题
一只蜘蛛有8条腿,一只蜻蜓有6条腿,如果蜘蛛、蜻蜓共有腿450条,蜘蛛的只数是 蜻蜓只数的3倍,那么蜘蛛有______只.
答案
设蜻蜓有x只,则蜘蛛就有3x只,根据题意可得方程:
6x+3x×8=450,
30x=450,
x=15,
所以蜘蛛哟:15×3=45(只),
答:蜘蛛有45只.
故答案为:45.
一只蜘蛛有8条腿,一只蜻蜓有6条腿,如果蜘蛛、蜻蜓共有腿450条,蜘蛛的只数是 蜻蜓只数的3倍,那么蜘蛛有______只.
设蜻蜓有x只,则蜘蛛就有3x只,根据题意可得方程:
6x+3x×8=450,
30x=450,
x=15,
所以蜘蛛哟:15×3=45(只),
答:蜘蛛有45只.
故答案为:45.
补全对话。 | |
P : Mum,we had a sports meeting yesterday. S: Oh, really? Is it exciting? P: Of course, it is __1__ S: Who won the girls' 400-metre race? P : Liu Ying , a girl from Class Four. S : __2___ P: Yes. At first Li Fang ran fastest. But she fell off. S : What a pity! ___3____ P : Ann jumped highest. She did quite well. S : ____4_____ P : Yes, she did. ____5__
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