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梁老师给同学们出了一道数学题(如图),求阴影部分的面积。同学们讨论后,分别说出了自己的思路:王红说:“平行四
Liang teacher to the students out of a math problem (Figure), seek the shadow of the area. After discussing with the students, they respectively expressed their own ideas: Wang Hong said: "Parallel four