题目内容

解下列方程.
6.9x-4.1=9.7
2(x+1.7)=9.2
4.5x+2=15.59x-5x=0.64
x÷1.4=2.52x-0.24=1.2.
(1)6.9x-4.1=9.7,
6.9x-4.1+4.1=9.7+4.1,
6.9x÷6.9=13.8÷6.9,
x=2;

(2)2(x+1.7)=9.2,
2(x+1.7)÷2=9.2÷2,
x+1.7-1.7=4.6-1.7,
x=2.9;

(3)4.5x+2=15.5,
4.5x=2-2=15.5-2,
4.5x÷4.5=13.5÷4.5,
x=3;

(4)9x-5x=0.64,
4x=0.64,
4x÷4=0.64÷4,
x=0.16;

(5)x÷1.4=2.5,
x÷1.4×1.4=2.5×1.4,
x=3.5;

(6)2x-0.24=1.2,
2x-0.24+0.24=1.2+0.24,
2x÷2=1.44÷2,
x=0.72.
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