挑战习题
1/5单选题
难度:

1.

用白铁皮做水桶,每张铁皮能做1个桶身或8个桶底,而1个桶身1个桶底正好配套做1个水桶,现在有63张这样的铁皮,则需要多少张做桶身,多少张做桶底正好配套?设用x张铁皮做桶身,则可得方程(   )


A

B

C

D

提示1:
PHA+5qG26Lqr5omA55So6ZOB55qu5byg5pWwK+ahtuW6leaJgOeUqOmTgeearuW8oOaVsD02MzwvcD4=
提示2:
PHA+5qG26Lqr5pWwPeahtuW6leaVsDwvcD4=
正确答案:Qg==
PGRpdj7op6PvvJrorr7nlKh45byg6ZOB55qu5YGa5qG26LqrLOagueaNrumimOaEj+WPr+W+l++8mjwvZGl2PjxkaXY+PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0YxL0E4L3JCQUNGRk1IRVRyd3YtUmpBQUFDRWdiYW9sUTI0NC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRjEvQTgvckJBQ0ZGTUhFVHJ3di1SakFBQUNFZ2Jhb2xRMjQ0LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjgzIj48L2Rpdj48ZGl2Puino+W+l++8mjxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xNC82OC9yQkFDRTFNSEVUclE4WEdzQUFBQmp3TWRlS2s2MjEucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzE0LzY4L3JCQUNFMU1IRVRyUThYR3NBQUFCandNZGVLazYyMS5wbmciIGhlaWdodD0iMjEiIHdpZHRoPSI0MSI+PC9kaXY+PGRpdj48aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMTQvNjgvckJBQ0UxTUhFVHJqS0JkSkFBQUJ3VDEtR25RNDY1LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8xNC82OC9yQkFDRTFNSEVUcmpLQmRKQUFBQndUMS1HblE0NjUucG5nIiBoZWlnaHQ9IjIxIiB3aWR0aD0iNzQiPijlvKApPC9kaXY+PGRpdj7nrZTvvJrpnIDopoHnlKg1NuW8oOmTgeearuWBmuahtui6q++8jDflvKDpk4Hnmq7lgZrmobblupUuPC9kaXY+