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63%5x=28解方程怎么解

5x=63-28=35 x=35÷5=7

12x-5x=63 7x=63 x=63÷7 x=9

解方程36×0.5+5x=63 36×0.5+5x=63 18+5x=63 5x=63-18 5x=45 x=9

4.5x+3.8x=16.6 8.3x=16.6 x=2

(5x÷6)÷(x+3+5x÷6)=5/12 5x/6÷(11x+18)/6=5/12 10x=(55x+90)/6 60x=55x+90 5x=90 x=18

x+2/5x=63 5x+2x=315 7x=315 x=45

增广矩阵 = 1 -5 2 -3 11 0 3 6 -1 1 2 4 2 1 -6 r3-2r1 1 -5 2 -3 11 0 3 6 -1 1 0 14 -2 7 -28 r3-5r2 1 -5 2 -3 11 0 3 6 -1 1 0 -1 -32 12 -33 r1-5r3, r2+3r3 1 0 162 -63 176 0 0 -90 35 -98 0 -1 -32 12 -33 r2*(-90) 1 0 162 -63 176 0 ...

1、3x-7y=1 5x-4y=17 1式x5,2式x3 ====> 15x-35y=5.....① 15x-12y=51....② ②-①=23y=46 y=2,x=5 2、23x+17y=63 17x+23y=57 ====>2式相加 40x+40y=120 x+y=3 结合原式: x=2,y=1

(1)5x-5×1 2 =20 5x-2.5=20 5x-2.5+2.5=20+2.5 5x=22.5 5x÷5=22.5÷5 x=4.5; (2)1 4 :x=8:15 8x=15×1 4 8x=15 4 8x÷8=15 4 ÷8 x=15 32 .

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