Решите уравнение: 1) -6(9-5х)=9х+9 2) -6(-5-7х)=-8х+2 3) 9+2(2х+1)=1 4) 4+5(-3х+7)=-9 5) -7+2(7х-2)=10 - id376506120230505 от lemenukillya 05.05.2023 00:05

Question

Алгебра: Решите уравнение: 1) -6(9-5х)=9х+9 2) -6(-5-7х)=-8х+2 3) 9+2(2х+1)=1 4) 4+5(-3х+7)=-9 5) -7+2(7х-2)=10 6) 10-2(-х-7)=9 7) 8-4(-7х+8)=4 8) -1+(7-6х)=2х+6 9) -2+3(1+2х)=-2х+3 10) -3х+4=-10+5(-7-х) 11) 5х-4=4-3(5-2х) 12) -1-4(-7+8х)=-2х-6 13) 4(7+х)-3х=7 ! help

lemenukillya · Accepted Answer

1)

1/7*(0,14+2,1-3,5) =

= 1/7 * (14/100 + 21/10 - 35/10) =

= 1/7 * 14/100 + 1/7 * 21/10 - 1/7 * 35/10 =

= 1/50 + 3/10 - 5/10 = 1/50 + 15/50 - 25/50 = -9/50 (или -0,18),

2)

1/12*(4,8-0,24-1,2) =

= 1/12*(48/10 - 24/100 - 12/10) =

= 1/12 * 48/10 - 1/12 * 24/100 - 1/12 * 12/10 =

= 4/10 - 1/50 - 1/10 = 20/50 - 1/50 - 5/50 = 14/50 = 7/25 (или 0,28),

3)

(18 6/7 + 21 3/4) : 3 =

= ((18 + 21) + (6/7 + 3/4)) : 3 =

= (39 + (24/28 + 21/28)) : 3 =

= (39 + 45/28) : 3 = 39 : 3 + 45/28 : 3 =

= 13 + 45/28 * 1/3 = 13 + 15/28 = 13 15/28,

4)

(15 5/7 + 20 15/16 ) * 1/5 =

= ((15 + 20) + (5/7 + 15/16)) * 1/5 =

= (35 + (80/112 + 105/112)) * 1/5 =

= (35 + 185/112) * 1/5 = 35 * 1/5 + 185/112 * 1/5 =

= 7 + 37/112 = 7 37/112

Решите уравнение: 1) -6(9-5х)=9х+9 2) -6(-5-7х)=-8х+2 3) 9+2(2х+1)=1 4) 4+5(-3х+7)=-9 5) -7+2(7х-2)=10 6) 10-2(-х-7)=9 7) 8-4(-7х+8)=4 8) -1+(7-6х)=2х+6 9) -2+3(1+2х)=-2х+3 10) -3х+4=-10+5(-7-х) 11) 5х-4=4-3(5-2х) 12) -1-4(-7+8х)=-2х-6 13) 4(7+х)-3х=7 ! help

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