Question

a) 2×+345=-3×+990 ?

b) 5×+780=2×450 ?

c) 2×+9000=22568 ?

d) 7×-490=77000 ?

e) 10×+500=5×-2000 ?​

Answer 1

Explicação passo-a-passo:

a) 3x + 2× = 990 - 345

5x = 645

X = 129

b) Se, 5x + 780 = 2x + 450

5x - 2x = -780 +450

3x = -330

× = -110

ou: 5x +780 = 2x450

5x +780 = 900x

900x - 5x = 780

895x = 780

X = 895/780 = 1,15 (aproximadamente)

c) 2x = 22568 - 9000

x = 13568/2 = 6784

d) 7x = 77000 + 490

x = 77490/7 = 11070

e) 10x -5x = -2000 -500

5x = -2500

x = -2500/5 = -500