Markdown公式對齊

(a+b)3=(a+b)(a+b)2=(a+b)(a2+2ab+b2)=a3+3a2b+3ab2+b3(3) \begin{aligned} (a + b)^3 &= (a + b) (a + b)^2 \\ &= (a + b)(a^2 + 2ab + b^2) \\ &= a^3 + 3a^2b + 3ab^2 + b^3 \tag{3} \end{aligned}
h(x)=1xt(x)dxf(x)=1xη(x)dxg(x)(2) \begin{aligned} h(x) =& \frac{1}{\int_xt(x)\mathrm{d}x} \\ f(x) =& \frac{1}{\int_x\eta(x)\mathrm{d}x}g(x)\tag{2} \end{aligned}

h(x)=1xt(x)dxf(x)=xη(x)dxg(x)\begin{aligned} h(x) =& \frac{1}{\int_xt(x)\mathrm{d}x} \\ f(x) =& {\int_x\eta(x)\mathrm{d}x}g(x)\end{aligned}

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