
求未知数的值。6.2-x =416,7x+2.5x =3.8,(3.8-2)x =14.4,3x -0.5=5.8,4*6+4x =84,10*(15-x )=120
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6.2-x=416
x=-409.8;
7x+2.5x=3.8
9.5x=3.8
x=0.4;
(3.8-2)x =14.4
1.8x=14.4
x=8;
3x-0.5=5.8
3x=6.3
x=2.1
4*6+4x =84
24+4x=84
4x=60
x=15
10*(15-x )=120
150-10x=120
10x=30
x=3
x=-409.8;
7x+2.5x=3.8
9.5x=3.8
x=0.4;
(3.8-2)x =14.4
1.8x=14.4
x=8;
3x-0.5=5.8
3x=6.3
x=2.1
4*6+4x =84
24+4x=84
4x=60
x=15
10*(15-x )=120
150-10x=120
10x=30
x=3
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