Ответ:
1) -4x=28
x=-7
2) 0.7x=-4.2
x=-6
3) (1/3)x=-2/9
x=-2
4) (4/7)x=1
x=7/4
5) 18x=9
x=1/2
6) 5-2(x-1)=4-x
5-2x+2=4-x
3x=-3
x=-1
7) 0.2(7-2y)=2.3-0.3(y-6)
1.4-0.4y=2.3-0.3y+1.8
-0.4y+0.3y=2.3-1.4-1.8
-0.1y=-1.9
y=19
8) (2/3)(1/3x-1/2)=4x+2 1/2
(2/9)x-(1/3)=(8/3)x+5/3
(2/9)x-(8/3)x=5/3+1/3
(-22/9)x=2
x=-9/11
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Answers & Comments
Ответ:
1) -4x=28
x=-7
2) 0.7x=-4.2
x=-6
3) (1/3)x=-2/9
x=-2
4) (4/7)x=1
x=7/4
5) 18x=9
x=1/2
6) 5-2(x-1)=4-x
5-2x+2=4-x
3x=-3
x=-1
7) 0.2(7-2y)=2.3-0.3(y-6)
1.4-0.4y=2.3-0.3y+1.8
-0.4y+0.3y=2.3-1.4-1.8
-0.1y=-1.9
y=19
8) (2/3)(1/3x-1/2)=4x+2 1/2
(2/9)x-(1/3)=(8/3)x+5/3
(2/9)x-(8/3)x=5/3+1/3
(-22/9)x=2
x=-9/11