(1)▏4▏+[6分之5÷(-3分之1)²×(-0.5)-0.25]÷(-2)²
=4+[6分之5÷9分之1×(-0.5)-0.25]÷4
=4+[-4分之15-4分之1]÷4
=4+[-4]÷4
=4-1
=3