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7.9x-x=8.97.方程怎么解?

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7.9x-x=8.97 6.9x=8.97 x=1.3

7.9x-x=8.97 (7.9-1)x=8.97 6.9x=8.97 x=8.97/6.9 x=1.3

∵方程x?8x?7?97?x=8的增根是x=7,∴x=7是方程的增根.故选B.

3.8+x=6.3 x=6.3-3.8 x=2.5 x-7.9=2.6 x=2.6+7.9 x=10.5 2.5x=14 x=14/2.5 x=5.6 x÷3=1.2 x=3.6 3.4x-48=26.8 3.4x=26.8+48 3.4x=74.8 x=22 2x-97=34.2 2x=34.2+97 2x=131.2 x=65.6 42x+25x=134 67x=134 x=2

1.25x9.97x0.8 =1.25x0.8x9.97 =1x9.97 =9.97

2.7x+3=97.5 解:2.7x=97.5-3 x=94.5÷2.7 x=35 0.95÷0.4x=1.9 解:0.4x=0.95÷1.9 x=0.5÷0.4 x=1.25 6.8+x=24.5 解: x=24.5-6.8 x=17.7 6x-4x7.5=24 解: 6x=24+30 x=54÷6 x=9 4.8x-8=25.6 解:4.8x=25.6+8 x=33.6÷4.8 x= 7 12x-6x5=210 解: 12...

运走货物x吨, x+97.8=128.5,x+97.8-97.8=128.5-97.8, x=30.7,答:运走货物30.7吨.

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