解方程,4x+9-3=147x-20-4x=14.51.2+5x+2.4=100.9x-27+13=67(14.8+x-

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  • 4x+9-3=14 4x=14+3-9 x=8/4=2

    7x-20-4x=14.5 3x=14.5+20 x=34.5/3=11.5

    1.2+5x+2.4=10 5x=10-1.2-2.4=6.6 x=6.6/5=1.32

    0.9x-27+13=67 0.9x=67+27-13=81 x=81/0.9=90

    (14.8+x-9.2)÷4=6.9 14.8+x-9.2=6.9*4=27.6 x=27.6+9.2-14.8=22

    (38.5-x-4.5)÷0.8=16 38.5-x-4.5=16*0.8=12.8 -x=12.8+4.5-38.5=-21.2 x=21.2

    2.5x+9-1.5x=25 2.5x-1.5x=25-9 x=16

    4x-7+5x=3.8 9x=3.8+7 x=10.8/9=1.2

    8x-26=6x 8x-6x=26 2x=26 x=13

    45-4x=5x 45=5x+4x x=5

    16.9-3x=7x 16.9=10x x=1.69

    7x=10x-1.8 1.8=10x-7x x=1.8/3=0.6

    15x=9.6+12x 15x-12x=9.6 3x=9.6 x=3.2

    26.4+3.6+2x=6x 30=6x-2x x=30/4=7.5

    9x-16-20=5x 9x-5x=20+16 4x=36 x=9

    (21-5x)÷2=x 21-5x=2x 21=7x x=3

    4×(x-3)=2x 4x-12=2x 2x=12 x=6