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解方程:6x=24 4.5x=90 0.8x=9.6 x÷3=12 y÷2.8=11 ...

(1)6x÷0.8=3 6x÷0.8×0.8=3×0.8 6x=2.4 6x÷6=2.4÷6 x=0.4;(2)9.2x-x=2.8 8.2x=2.8 8.2x÷8.2=2.8÷8.2 x=1441;(3)x÷8.6=8.6x÷8.6×8.6=8.6×8.6 x=73.96;(4)2.75+0.25x=102.75+0.25x-2.75=10-2.75 0.25x=7.25 0.25x÷0.25=7.25÷0.25 x=29.

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...

x2-6x+2=0移项,得x2-6x=-2,即x2-6x+9=-2+9,∴(x-3)2=7,解得x-3=±7,即x=3±7.∴x1=3+7,x2=3-7.

解:6×100+80=x x=6×100+80 x=600+80 x=680

15x+45.6=87.6 15x=87.6-45.6 15x=42 x=2.8

(1)x÷9=12 x÷9×9=12×9 x=108;(2)6x=80 6x÷6=80÷6 x=403;(3)25+x=3425+x?25=34?25 x=35;(4)x-23=15 x-23+23=15+23 x=1315.

6x+4.5x=56.7 (6+4.5)x=56.7 10.5x=56.7 x=567/105(即5又105分之42)

1:X×2+5=15 2:6X+5=11 3:X-0.8X=6 4:19y+y=40 5:25-5x=15 6:79y+y=80 7:42x+28x=140 8:3x-1=8 9:90y-90=90 10:80y-90=70 11:78y+2y=160 12:88-x=80 13:9-4x=1 14:20x=40 15:65y-30=100 16:51y-y=100 17:6X-3X=18 18:1.5x+18=3x 19:5×3-x...

x+2.5=8 370+x=580 0.7x=0.991 x-6.3=10 x÷12=180 3x=0.6 x+6=145 24+x=28 x÷0.5=3 x-154=6 x-12.5=25 3.5x=2.8 x÷0.8=5 x+1.25=25 4.5x18 15+x=42 3.5-x=2.5 x÷0.5=5 x-8.6=8.6 x÷12=2.5 8x=4 20-x=20 25÷x=10 0.25x=8 x-32=75 x+16=76 x-7/9=2...

14x+6(11-x)=54----14x+66-6X=54-----8X=54-66----X= -3/2 5x+8(15-x)=90 ----5X+120-8X=90 ------3X=120-90---X=10 以后的都这样解

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