我想要如下的效果MWE如下:documentclass{article} usepackage{amsmath}% http://ctan.org/pkg/amsmath begin{document} [ underbrace{begin{pmatrix}x_1\x_2\x_3end{pmatrix}}_boldsymbol{x} =underbrace{begin{pmatrix}1&-1&1...
我想要如下的效果MWE如下:documentclass{article} usepackage{amsmath}% http://ctan.org/pkg/amsmath begin{document} [ underbrace{begin{pmatrix}x_1\x_2\x_3end{pmatrix}}_boldsymbol{x} =underbrace{begin{pmatrix}1&-1&1...
我想要如下的效果MWE如下:documentclass{article} usepackage{amsmath}% http://ctan.org/pkg/amsmath begin{document} [ underbrace{begin{pmatrix}x_1\x_2\x_3end{pmatrix}}_boldsymbol{x} =underbrace{begin{pmatrix}1&-1&1...
我想要如下的效果MWE如下:documentclass{article} usepackage{amsmath}% http://ctan.org/pkg/amsmath begin{document} [ underbrace{begin{pmatrix}x_1\x_2\x_3end{pmatrix}}_boldsymbol{x} =underbrace{begin{pmatrix}1&-1&1...
