Question

Определите положительным или отрицательным числом является значение выражения и выполните вычисления а) (-0,5)*(-1,4)*2 б) 0,8*5*(-25) в) 9*(-5)*0,2 г) (-30,25)*(-4)*1*100 д) (-1)*2*(-4)*(1,25) е) (0,1)*(-154)*(-0,5)*(-100) Помагите срочно надо кто первый лучший поставлю

Answer 1

А)1,4  б)-100 в)-9  г)120900   д)10  е)-770

Answer 2

Evaluating Expressions and Determining Sign

To determine whether the value of an expression is positive or negative, we need to evaluate the expression by performing the calculations. Let's evaluate each expression and determine their signs:

a) (-0.5) * (-1.4) * 2: - Multiplying two negative numbers gives a positive result. - Therefore, the value of this expression is positive.

b) 0.8 * 5 * (-25): - Multiplying a positive number by a negative number gives a negative result. - Therefore, the value of this expression is negative.

c) 9 * (-5) * 0.2: - Multiplying a positive number by a negative number gives a negative result. - Therefore, the value of this expression is negative.

d) (-30.25) * (-4) * 1 * 100: - Multiplying two negative numbers gives a positive result. - Therefore, the value of this expression is positive.

e) (-1) * 2 * (-4) * 1.25: - Multiplying two negative numbers gives a positive result. - Therefore, the value of this expression is positive.

f) (0.1) * (-154) * (-0.5) * (-100): - Multiplying three negative numbers gives a negative result. - Therefore, the value of this expression is negative.

Calculations:

Let's perform the calculations for each expression:

a) (-0.5) * (-1.4) * 2 = 1.4

b) 0.8 * 5 * (-25) = -100

c) 9 * (-5) * 0.2 = -9

d) (-30.25) * (-4) * 1 * 100 = 12,100

e) (-1) * 2 * (-4) * 1.25 = 10

f) (0.1) * (-154) * (-0.5) * (-100) = 770

Summary:

a) The value of the expression (-0.5) * (-1.4) * 2 is 1.4 and it is positive. b) The value of the expression 0.8 * 5 * (-25) is -100 and it is negative. c) The value of the expression 9 * (-5) * 0.2 is -9 and it is negative. d) The value of the expression (-30.25) * (-4) * 1 * 100 is 12,100 and it is positive. e) The value of the expression (-1) * 2 * (-4) * 1.25 is 10 and it is positive. f) The value of the expression (0.1) * (-154) * (-0.5) * (-100) is 770 and it is negative.

I hope this helps! Let me know if you have any further questions.