问题 解答题
解方程.
3×7+4x=273(2x+2.1)=10.52.4α-0.46=1.94.
答案

(1)3×7+4x=27,

21+4x=27,

21+4x-21=27-21,

4x=6,

4x÷4=6÷4,

x=1.5;

(2)3(2x+2.1)=10.5,

6x+6.3=10.5,

6x+6.3-6.3=10.5-6.3,

6x=4.2,

6x÷6=4.2÷6,

x=0.7;

(3)2.4α-0.46=1.94,

2.4α-0.46+0.46=1.94+0.46,

2.4a=2.4,

2.4a÷2.4=2.4÷2.4,

a=1.

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