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1.8+7x=3.9怎么解方程

1.8+7x=3.9 7x=3.9-1.8 7x=2.1 x=0.3

解:原方程即: 8.8x=3.9 x=3.9÷8.8 x=39/88 把x=39/88代入原方程检验, 1.8x39/88+7x39/88 =(1.8+7)x39/88 =8.8x39/88 =3.9

7x÷3=8.182190727573 7x=24.546572182719 x=3.506653168959857

7x+1.8=36.8 解 7x=36.8-1.8 7x=35 x=35/7 解得x=5

(1)3×7+4X=25 21+4x=25, 4x=4, x=1;(2)6X+18=48 6x=30, x=5;(3)7X-4X=18 3x=18, x=6;(4)9X-1.8=2.7 9x=4.5, x=0.5.

x+y=100

x÷1.5-1.25=0.75 4x-1.3×6=2.6 20-9x=1.2×6.25 6x+12.8=15.8 150×2+3x=690 2x-20=4 3x+6=18 2(2.8+x)=10.4 (x-3)÷2=7.5 13.2x+9x=33.3 3x=x+100 x+4.8=7.2 6x+18=48 3(x+2.1)=10.5 12x-9x=8.7 13(x+5)=169 2x-97=34.2 3.4x-48=26.8 42x+25x=134 ...

(1)4×(0.8-x)=1.4 3.2-4x=1.4 4x=3.2-1.4 4x=1.8 x=0.45 (2)5+2/3x-1/2x=12 2/3x-1/2x=12-5 4/6x-3/6x=7 1/6x=7 x=42 (3)10x+9=8x+19 10x-8x=19-9 2x=10 x=5 (4)115%x+15%x=1.3 130%x=1.3 1.3x=1.3 x=1 (5)2x-1.6×5=12 2x-8=12 2x=12+8 2x=20 ...

3X+5X=48 14X-8X=12 6*5+2X=44 20X-50=50 28+6X=88 32-22X=10 24-3X=3 10X*(5+1)=60 99X=100-X X+3=18 X-6=12 56-2X=20 4y+2=6 x+32=76 3x+6=18 16+8x=40 2x-8=8 4x-3*9=29 8x-3x=105 x-6*5=42 x+5=7 2x+3=10 12x-9x=9 6x+18=48 56x-50x=30 5x...

7x-2(x-2.6)=14.8 7x -2x +5.2 = 14.8 5x = 9.6 x = 1.92

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