Kneeling for 30 rational mixed operation problems, there is a process to answer, thank you o (∩)_ ∩)O

Kneeling for 30 rational mixed operation problems, there is a process to answer, thank you o (∩)_ ∩)O

Exercise 1 (Level B)
（1） Calculation questions:
(1)23+(-73)
(2)(-84)+(-49)
(3)7+(-2.04)
(4)4.23+(-7.57)
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)3.75+(2.25)+5/4
(8)-3.75+(+5/4)+(-1.5)
（2） It is calculated by a simple method
(1)(-17/4)+(-10/3)+(+13/3)+(11/3)
(2)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)
（3） Known: x = + 17 (3 / 4), y = - 9 (5 / 11), z = - 2.25,
Find the value of (- x) + (- y) + Z
（4） With ">", "0", then A-ba (c) if BA (d) if AA, then B is_____________ (3) subtract - π from - 3.14, and the difference should be -____________ (4) if the subtracted is - 12 (4 / 5) and the difference is 4.2, then the subtracted should be -_____________ (5) if b-aa (c) 2A > AB (d) a / b > 1
（2） Fill in the blanks:
(1) When | a | / a = 1, a______________ When | a | / a = - 1, a______________ 0; (fill in >, 0, then a___________ If AB / C0, then B___________ (12) if a / b > 0, B / C (- 0.3) 4 > - 106 (b) (- 0.3) 4 > - 106 > (- 0.2) 3 (c) - 106 > (- 0.2) 3 > (- 0.3) 4 (d) (- 0.3) 4 > (- 0.2) 3 > - 106 (4) if a is a rational number and A2 > A, then the value range of a is () (a) A0 (d) A0 (c) a, B is opposite; (d) - AB (c) a
(5) The range of the exact number a indicated by the approximate number 1.20 obtained by the rounding method is ()
(A)1.195≤a