1、 Calculation: (1) - 3.75 + (- quarter) equals (); (2) (- 4) + (- 10) + 4 equals (). 2. (1) if a = - 2, then a+|- 2、 (1) if a = - 2, then a + | - a | equals (); (2) If | a | = 2, | B | = 3, then a + B equals () 3、 If one number is 9 and the other number is 2 larger than the opposite number of 9, then the sum of the two numbers is () 4、 Calculate the following questions: (1) 6 + (- 5.6); (2) 0 + (- 6 and 1 / 4) 5、 When a = - 3.6, B = - 2 and 3 / 5, find the values of the following formulas （1）-a+（-b）；（2）（-a）+b Offer a reward before 9:20!

1、 Calculation: (1) - 3.75 + (- quarter) equals (); (2) (- 4) + (- 10) + 4 equals (). 2. (1) if a = - 2, then a+|- 2、 (1) if a = - 2, then a + | - a | equals (); (2) If | a | = 2, | B | = 3, then a + B equals () 3、 If one number is 9 and the other number is 2 larger than the opposite number of 9, then the sum of the two numbers is () 4、 Calculate the following questions: (1) 6 + (- 5.6); (2) 0 + (- 6 and 1 / 4) 5、 When a = - 3.6, B = - 2 and 3 / 5, find the values of the following formulas （1）-a+（-b）；（2）（-a）+b Offer a reward before 9:20!

One (1) - 4
   （2）-10
Two (1) 4 & nbsp; (2) a + B = 5 or - 5 or 1 or - 1
Three & nbsp; - another number is: - 9 + 2 = - 7
&Sum of two numbers: - 7 + 9 = 2
(1) 0
     （2)-6.25
Five & nbsp; & nbsp; a = - 3.6, B = - 2-0.6 = - 2.6
     (1)-a-b=3.6+2.6=6.2;
      (2)-a+b=3.6-2.6=1

One two quarter equals four one eighth equals six one half, right? Please correct? How do you understand this? Please explain the basic principle and its formula?

A two-quarters = 1 * (2 / 4) = 0.5
Four eighths = 4 * (1 / 8) = 0.5
Half of six = 6 * (1 * 2) = 3

Two 1 / 4 equals four 1 / 8 equals three 1 / 6, right? Please correct? How to understand this? Please explain the basic principle and its formula?

Two 1 / 4 equals four 1 / 8 equals three 1 / 6 yes
Because 2 × 1 / 4 = 1 / 2
4×1/8=1/2
3×1/6=1/2