Question

1) 14-2*15:6+4 2) -2*15:(-6)-14+4 3) 1,4-2*1,5:0,6+4 4) -2*0:(-6)-14+4 5) у2-21=4 помогите решить пожалуйста

Answer 1

1) 14-5+4=14-1=13
2) 5-14+4= 5-10=-5
3) 1.4-5+4=0.4
4) 0-14+4=-10
5) y²=25; y=±5

Answer 2

Calculations

Let's solve the given mathematical expressions step by step:

1) 14-2*15:6+4+2 First, perform the multiplication and division from left to right: 14 - 2 * 15 ÷ 6 + 4 + 2 = 14 - 30 ÷ 6 + 4 + 2 = 14 - 5 + 4 + 2 = 15

Therefore, the result of the expression 14-2*15:6+4+2 is 15.

2) -2*15:(-6)-14+4+3

First, perform the multiplication and division from left to right: -2 * 15 ÷ (-6) - 14 + 4 + 3 = -30 ÷ (-6) - 14 + 4 + 3 = 5 - 14 + 4 + 3 = -2

Therefore, the result of the expression -2*15:(-6)-14+4+3 is -2.

3) 1,4-2*1,5:0,6+4+4

First, perform the multiplication and division from left to right: 1.4 - 2 * 1.5 ÷ 0.6 + 4 + 4 = 1.4 - 3 ÷ 0.6 + 4 + 4 = 1.4 - 5 + 4 + 4 = 4.4

Therefore, the result of the expression 1,4-2*1,5:0,6+4+4 is 4.4.

4) -2*0:(-6)-14+4+5

First, perform the multiplication and division from left to right: -2 * 0 ÷ (-6) - 14 + 4 + 5 = 0 ÷ (-6) - 14 + 4 + 5 = 0 - 14 + 4 + 5 = -5

Therefore, the result of the expression -2*0:(-6)-14+4+5 is -5.

Equation

The equation "y2-21=4" is given. To solve for y, we can add 21 to both sides of the equation: y2 - 21 + 21 = 4 + 21 y2 = 25

Taking the square root of both sides, we get: y = ±5

Therefore, the solutions for the equation y2-21=4 are y = 5 and y = -5.