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圓圈是46;三角是4;方框是74.可用三元一次方程解.設圓圈、方框、三角分別為x、y、z,則依題可得x+y=180,z+y=78,z+x=50,聯解得x=46,y=74,x=4,即圓圈是46;三角是4;方框是74.
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