X-0.55倍= 0.9 4X-3.9 = 4.5解方程_数学解答

X-0.55倍= 0.9 4X-3.9 = 4.5解方程

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解答

X-0.55倍= 0.9 0.45倍= 0.9×2 = 4X-3.9 = 4.5 4X = 8.4×2.1 =