Question

-4(2,5а-1,5)+5,5а-8 при а=-2/9 решите пж

Answer 1

☆HelloMyFrends☆
=================
-4(2,5-2,9-1,5)+5,5-2,9-8=-10+11,6+6+5,5-2,9-8=2,2

Answer 2

To solve the expression, let's substitute the value of "a" into the given expression and perform the calculations step by step.

Given expression: -4(2.5a - 1.5) + 5.5a - 8 Value of "a": a = -2/9

Step 1: Substitute the value of "a" into the expression: -4(2.5 * (-2/9) - 1.5) + 5.5 * (-2/9) - 8

Step 2: Perform the calculations inside the parentheses: -4(-5/9 - 1.5) - 11/9 - 8

Step 3: Continue with the calculations: -4(-5/9 - 9/6) - 11/9 - 8 -4(-5/9 - 3/2) - 11/9 - 8

Step 4: Find a common denominator for the fractions inside the parentheses: -4((-5 * 2)/(9 * 2) - (3 * 9)/(2 * 9)) - 11/9 - 8 -4((-10/18) - (27/18)) - 11/9 - 8

Step 5: Combine the fractions inside the parentheses: -4((-10 - 27)/18) - 11/9 - 8 -4(-37/18) - 11/9 - 8

Step 6: Multiply -4 by -37/18: 148/18 - 11/9 - 8

Step 7: Find a common denominator for the remaining fractions: (148 * 2)/(18 * 2) - (11 * 2)/(9 * 2) - (8 * 18)/(18 * 18) 296/36 - 22/18 - 144/18

Step 8: Combine the fractions: 296/36 - (22 + 144)/18

Step 9: Continue with the calculations: 296/36 - 166/18

Step 10: Find a common denominator for the fractions: (296 * 2)/(36 * 2) - (166 * 2)/(18 * 2) 592/72 - 332/36

Step 11: Combine the fractions: 592/72 - 332/36

Step 12: Find a common denominator for the fractions: (592 * 1)/(72 * 1) - (332 * 2)/(36 * 2) 592/72 - 664/72

Step 13: Combine the fractions: (592 - 664)/72 -72/72

Step 14: Simplify the fraction: -1

So, when a = -2/9, the expression -4(2.5a - 1.5) + 5.5a - 8 equals -1.