问题 解答题
解方程.
4x+5.2=5.24.8x+2.6x=3.72(x+8)=22
58.4-3x=31.4y÷4+3.2=13.2x-0.36x=16.
答案

根据题意可得:

(1)4x+5.2=5.2,

4x+5.2-5.2=5.2-5.2,

4x=0,

4x÷4=0÷4,

x=0;

(2)4.8x+2.6x=3.7,

7.4x=3.7,

7.4x÷7.4=3.7÷7.4,

x=0.5;

(3)2(x+8)=22,

2(x+8)÷2=22÷2,

x+8=11,

x+8-8=11-8,

x=3;

(4)58.4-3x=31.4,

58.4-3x+3x=31.4+3x,

3x+31.4=58.4,

3x+31.4-31.4=58.4-31.4,

3x=27,

3x÷3=27÷3,

x=9;

(5)y÷4+3.2=13.2,

y÷4+3.2-3.2=13.2-3.2,

y÷4=10,

y÷4×4=10×4,

y=40;

(6)x-0.36x=16,

0.64x=16,

0.64x÷0.64=16÷0.64,

x=25.

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