A.\[\mathop \smallint \limits_a^c f\left( x \right)d{\rm{x}} = \mathop \smallint \limits_a^b f\left( x \right)d{\rm{x}} + \mathop \smallint \limits_b^c f\left( x \right)d{\rm{x}}\]
B. \[\mathop \smallint \limits_a^b f\left( x \right)d{\rm{x}} = \mathop \smallint \limits_a^c f\left( x \right)d{\rm{x}} - \mathop \smallint \limits_b^c f\left( x \right)d{\rm{x}}\]
C. \[\mathop \smallint \limits_a^b f\left( x \right)d{\rm{x}} = \mathop \smallint \limits_b^a f\left( x \right)d{\rm{x}} + \mathop \smallint \limits_a^c f\left( x \right)d{\rm{x}}\]
D. \[\mathop \smallint \limits_a^b cf\left( x \right)d{\rm{x}} = - {\rm{c}}\mathop \smallint \limits_b^a f\left( x \right)d{\rm{x}}\]
Dựa vào các đáp án ta có nhận xét sau:
\[\mathop \smallint \limits_a^c f(x)dx = \mathop \smallint \limits_a^b f(x)dx + \mathop \smallint \limits_b^c f(x)dx\] => A đúng
\[\mathop \smallint \limits_a^b f(x)dx = \mathop \smallint \limits_a^c f(x)dx - \mathop \smallint \limits_b^c f(x)dx\] B đúng
\[\mathop \smallint \limits_a^b f(x)dx = \mathop \smallint \limits_b^a f(x)dx + \mathop \smallint \limits_a^c f(x)dx\] C sai
\[\mathop \smallint \limits_a^b cf(x)dx = - c\mathop \smallint \limits_b^a f(x)dx\] D đúng.
Đáp án cần chọn là: C
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