问题 解答题

求未知数x.

x+36=98

x-45=63

4.5+x=27.3

2x-17=42.

答案

(1)x+36=98,

x+36-36=98-36,

x=62;

(2)x-45=63,

x-45+45=63+45,

x=108;

(3)4.5+x=27.3,

4.5+x-4.5=27.3-4.5,

x=22.8;

(4)2x-17=42,

2x-17+17=42+17,

2x=59,

2x÷2=59÷2,

x=29.5.

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