3.有100公顷麦地,共产麦子642吨,其中好地没公顷产7.2吨,其余的地每公顷产6吨.问有好地多少公顷?

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• 3.有100公顷麦地,共产麦子642吨,其中好地没公顷产7.2吨,其余的地每公顷产6吨.问有好地多少公顷?
• 3.有100公顷麦地,共产麦子642吨,其中好地没公顷产7.2吨,其余的地每公顷产6吨.问有好地多少公顷?
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