1, calculated according to the distribution law:

( 1) (-4) * (5/4-3/2)

Solution: The original formula =(-4)x4/5-( 14)x2/3.

= 1

(2) (2-3 in 9 65438+0-2 in 27) X27

Solution: Original formula =9/2x27-3/ 1x27-27/2x27.

=-5

(also tell me the calculation method. )

2, with a simple method to calculate:

( 1)(- 19)x 9 1+9 1x(-8 1)

Solution: The original formula = [(-19)+(-81)] x 91.

=(- 100)x9 1

=-9 100

(2)(-270)*4 1+0.25+(-8 and 2 1)*(-25%) is wrong, it should be (-270)*4 1.25 * 2 1.

Solution: original formula = 0.25x [(-270)+21.5+(-82/1)].

= 0.25 times (-240)

=-60

(Tell me the calculation method)

*6. There are 10 numbers multiplied, and the product is negative. So how many possibilities are there for the number of negative numbers in 10? If there is a number 100 multiplied, is the product negative?

Question 1: 1, 3, 5, 7, 9

Second question: 1, 3,5,7,9 ... 97,99

2.4 You didn't divide the rational number. Think for yourself! It's best to do it yourself!