题目内容

4x-0.4=9.40.6x+0.3×4=4.26×8-7x=2.54x+1.5x=4.4.
(1)4x-0.4=9.4,
4x-0.4+0.4=9.4+0.4,
4x=9.8,
4x÷4=9.8÷4,
x=2.45;

(2)0.6x+0.3×4=4.2,
0.6x+1.2=4.2,
0.6x+1.2-1.2=4.2-1.2,
0.6x=3,
0.6x÷0.6=3÷0.6,
x=5;

(3)6×8-7x=2.5,
48-7x=2.5,
48-7x+7x=2.5+7x,
2.5+7x=48,
2.5+7x-2.5=48-2.5,
7x=45.5,
7x÷7=45.5÷7,
x=6.5;

(4)4x+1.5x=4.4,
5.5x=4.4,
5.5x÷5.5=4.4÷5.5,
x=0.8.
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