1.2345²+2.469×0.7655+0.7655²=?
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![1.2345²+2.469×0.7655+0.7655²=?](/uploads/image/z/607090-58-0.jpg?t=1.2345%26%23178%3B%EF%BC%8B2.469%C3%970.7655%EF%BC%8B0.7655%26%23178%3B%3D%3F)
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1.2345²+2.469×0.7655+0.7655²=?
1.2345²+2.469×0.7655+0.7655²=?
1.2345²+2.469×0.7655+0.7655²=?
1.2345²+2.469×0.7655+0.7655²
=1.2345²+2×1.2345×0.7655+0.7655²
=(1.2345+0.7655)²
=2²
=4
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原式=1.2345^2 + 2*1.2345*0.7655+0.7655^2
=(1.2345+0.7655)^2
=2^2
=4