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简介:
(1)(0.5+x)+x=9.8÷2
0.5+2x=4.9
0.5+2x-0.5=4.9-0.5
2x=4.4
2x÷2=4.4÷2
x=2.2
(2)2(x+x+0.5)=9.8
2x+2x+1=9.8
4x+1-1=9.8-1
4x=8.8
4x÷4=8.8÷4
x=2.2
(3)25000+x=6x
25000+x-x=6x-x
5x=25000
5x÷5=25000÷5
x=5000
(4)3200=440+5x+x
6x+440=3200
6x+450-450=3200-440
6x=2760
6x÷6=2760÷6
x=460
(5)x-0.8x=6
0.2x=6
0.2x÷0.2=6÷0.2
x=30
(6)12x-8x=4.8
4x=4.8
4x÷4=4.8÷4
x=1.2
(7) 7.5+2x=15
2x+7.5-7.5=15-7.5
2x=7.5
x=3.75