Classroom exercises:

(1). 1+7 points 1-(-3 points 7)

Solution: The original formula = 1+7 part 1+3 part 7 (reason: negative is positive).

= 1+4/7 (similar items can be added directly)

= 1 65438+0 of 7 (you take1as 7 of 7)

(2) .2.5-4+( 1 inch -2)

Solutions; Original formula = 0 in 65438+2.5-4-2.

= 2.5-8- 1.

= 2.5-7/2

=2.5 is 5 of 2, so 5 of 2-7 of 2.

=-5/2 (I don't know if this question is right)

(3).-65438 gives 3+0+2 1+4 1.

Solution: The original formula =-65438+4/02+65438+6/02+65438+3/02.

= 2+of12/3 of kloc-0/2

= 65438+5/02 (You share everything)

(4).2+0+(-2/3)-(-4/5)+(-65/2+0)

Solution: The original formula = 1-2+5+ 1.

= 2 1 and -2 1. Cross out 2+4 of -5.

=-1510+1512 (total score)

= 65438+2/05

P7 1 knowledge and skills

The first question:

( 1).-2.5+(-5 1) (2).0.4-(-4 1)+6 1.

Solution: original formula =-5-5 1 solution: original formula =0.4+4 1+6 1.

=-65438+25 in 00-65438+2 in 00 = 0.4+65438+3 in 02+65438+2 in 02.

=-/kloc-27 in 0/0 = 0.4+65438+5 in 02.

= the result is not clear, do it yourself!

Sorry, I'm so tired. The following questions are exactly the same as the above questions. Give points!

Give you a topic:

(3).3% 1-(-5/6)+2/3 (4).3% 1+(-5% 1+2/3.

(5). 27- 18+(-7)-32(6). 0.5+(-4 of 1)-(-2.75)+2 of 1。