计算:1.992-1.98*1.99+0.992

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计算:1.992-1.98*1.99+0.992计算:1.992-1.98*1.99+0.992计算:1.992-1.98*1.99+0.992=1.99²-2×0.99×1.99+0.99

计算:1.992-1.98*1.99+0.992
计算:1.992-1.98*1.99+0.992

计算:1.992-1.98*1.99+0.992
=1.99²-2×0.99×1.99+0.99²
=(1.99-0.99)²
=1