化简:1.2×1.2×1.2−0.2×0.2×0.21.2×1.2+1.2×0.2+0.2×0.2
已知
1.2×1.2×1.2−0.2×0.2×0.21.2×1.2+1.2×0.2+0.2×0.2
要求
我们需要化简给定的表达式。
解答
我们知道:
a3+b3=(a+b)(a2−ab+b2)
a3−b3=(a−b)(a2+ab+b2)
因此:
1.2×1.2×1.2−0.2×0.2×0.21.2×1.2+1.2×0.2+0.2×0.2
令 a=1.2,b=0.2
这意味着:
1.2×1.2×1.2−0.2×0.2×0.21.2×1.2+1.2×0.2+0.2×0.2=a3−b3a2+ab+b2
=(a−b)(a2+ab+b2)a2+ab+b2
=a−b
=1.2−0.2
=1
因此,1.2×1.2×1.2−0.2×0.2×0.21.2×1.2+1.2×0.2+0.2×0.2=1。
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