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This paper considers the stability and L₂-<inline-formula> <tex-math notation="LaTeX">$\text{L}_\infty $ </tex-math></inline-formula> control problem for It<inline-formula> <tex-math notation="LaTeX">$\hat {o}$ </tex-math></inline-formula> stochastic systems with the sawtooth-like input delay. Compared with previously-known results on systems with the sawtooth-like input delay, a new auxiliary system is introduced to reduce the conservatism of the system. Besides, the influence of stochastic noises is investigated. For the delayed stochastic system without the disturbance, an LMI type mean-square asymptotical stability criterion is derived by using the Bessel-Legendre stochastic inequality and a modified finite-interval quadratic polynomial inequality. Then a linear feedback controller is proposed to realize the stability of the system with a prescribed L₂-<inline-formula> <tex-math notation="LaTeX">$\text{L}_\infty $ </tex-math></inline-formula> performance under the influence of disturbances, where the controller gain matrix is designed by introducing slack variables. To be pointed out that the augmented Lyapunov-Krasovskii functional (LKF) used in this paper is new, which is constructed by introducing an auxiliary system to increase the delay-dependent function terms in the discriminant. Finally, two numerical examples are given to show the validness and effectiveness of the theoretical results.