3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算
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![3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算](/uploads/image/z/189569-65-9.jpg?t=3%E5%8F%881%2F7+x+%283%E5%8F%881%2F7+-+7%E5%8F%881%2F3%EF%BC%89x+7%2F22+%C3%B71%E5%8F%881%2F21+%E8%AE%A1%E7%AE%97)
3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算
3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算
3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算
3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21
=22/7 x7/22× (22/7 - 22/3)x 21/22
= (22/7-22/3)×21/22
=22/7×21/22-22/3×21/22
=3-7
=-4