展开 2(16x^4-72^2=81)

解答

展开

2 (16 x^{4} - 7 2^{2} = 81)

32 x^{4} - 10368 = 81

求解步骤

2 (16 x^{4} - 7 2^{2} = 81)

= 2 (16 x^{4} - 7 2^{2} \cdot 81 =)

使用分配律:

a (b - c) = ab - a c

a = 2, b = 16 x^{4}, c = 7 2^{2} = 81

2 \cdot 16 x^{4} - 2 \cdot 7 2^{2} = 81

2 \cdot 16 x^{4} - 7 2^{2} \cdot 2 = 81

乘开

2 \cdot 16 x^{4} - 7 2^{2} \cdot 2 : 32 x^{4} - 10368

32 x^{4} - 10368 = 81

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