
16-x÷3=10 5x+3(x-2)=15.6 6x-48=5x+3 3x+2.7=5.94(并检验) &n...
16-x÷3=105x+3(x-2)=15.66x-48=5x+33x+2.7=5.94(并检验)3.5-0.5X=33X+12=5X-6....
16-x÷3=10 5x+3(x-2)=15.6 6x-48=5x+3 3x+2.7=5.94(并检验) 3.5-0.5X=3 3X+12=5X-6.
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(1)16-x÷3=10
16-x÷3-10=10-10
6-x÷3+(x÷3)=0+x÷3
x÷3=6
x÷3×3=6×3
x=18;
(2)5x+3(x-2)=15.6
5x+3x-6=15.6
8x-6=15.6
8x-6+6=15.6+6
8x=21.6
8x÷8=21.6÷8
x=2.7;
(3)6x-48=5x+3
6x-48+48=5x+3+48
6x=5x+51
6x-5x=5x+51-5x
x=51;
(4)3x+2.7=5.94
3x+2.7-2.7=5.94-2.7
3x=3.24
3x÷3=3.24÷3
x=1.08;
检验:
把x=1.08代入方程3x+2.7=5.94中,左边=3×1.08+2.7=3.24+2.7=5.94=右边,因此x=1.08是方程3x+2.7=5.94的解.
(5)3.5-0.5X=3
3.5-0.5X+0.5X=3+0.5X
3+0.5X=3.5
3+0.5X-3=3.5-3
0.5X=0.5
0.5X÷0.5=0.5÷0.5
X=1;
(6)3X+12=5X-6
3X+12-12=5X-6-12
3X=5X-18
3X-3X=5X-18-3X
2X-18=0
2X-18+18=0+18
2X=18
2X÷2=18÷2
X=9.
16-x÷3-10=10-10
6-x÷3+(x÷3)=0+x÷3
x÷3=6
x÷3×3=6×3
x=18;
(2)5x+3(x-2)=15.6
5x+3x-6=15.6
8x-6=15.6
8x-6+6=15.6+6
8x=21.6
8x÷8=21.6÷8
x=2.7;
(3)6x-48=5x+3
6x-48+48=5x+3+48
6x=5x+51
6x-5x=5x+51-5x
x=51;
(4)3x+2.7=5.94
3x+2.7-2.7=5.94-2.7
3x=3.24
3x÷3=3.24÷3
x=1.08;
检验:
把x=1.08代入方程3x+2.7=5.94中,左边=3×1.08+2.7=3.24+2.7=5.94=右边,因此x=1.08是方程3x+2.7=5.94的解.
(5)3.5-0.5X=3
3.5-0.5X+0.5X=3+0.5X
3+0.5X=3.5
3+0.5X-3=3.5-3
0.5X=0.5
0.5X÷0.5=0.5÷0.5
X=1;
(6)3X+12=5X-6
3X+12-12=5X-6-12
3X=5X-18
3X-3X=5X-18-3X
2X-18=0
2X-18+18=0+18
2X=18
2X÷2=18÷2
X=9.
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