问题 解答题

解方程.

x+45=550

x-0.52=1.3

x÷3=95

0.9x=2.43.

答案

(1)x+45=550,

x+45-45=550-45,

x=505;

(2)x-0.52=1.3,

x-0.52+0.52=1.3+0.52,

x=1.82;

(3)x÷3=95,

x÷3×3=95×3,

x=285;

(4)0.9x=2.43,

0.9x÷0.9=2.43÷0.9,

x=2.7.

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