问题
解答题
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答案
(1)5x-3.9=5.1,
5x-3.9+3.9=5.1+3.9,
5x=9,
5x÷5=9÷5,
x=1.8;
(2)6x-3x=4.8,
3x=4.8,
3x÷3=4.8÷3,
x=1.6;
(3)9+4x=249,
9+4x-9=249-9,
4x=240,
4x÷4=240÷4,
x=60.
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(1)5x-3.9=5.1,
5x-3.9+3.9=5.1+3.9,
5x=9,
5x÷5=9÷5,
x=1.8;
(2)6x-3x=4.8,
3x=4.8,
3x÷3=4.8÷3,
x=1.6;
(3)9+4x=249,
9+4x-9=249-9,
4x=240,
4x÷4=240÷4,
x=60.