求未知数x.①5x-1.5x+5.8=40.8 ...
求未知数x.①5x-1.5x+5.8=40.8②4(45+x)-3x+25=8....
求未知数x.①5x-1.5x+5.8=40.8 ②4(45+x)-3x+25=8.
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(1)5x-1.5x+5.8=40.8,
3.5x+5.8=40.8,
3.5x+5.8-5.8=40.8-5.8,
3.5x÷3.5=35÷3.5,
x=10;
(2)4(
+x)-3x+
=8,
3+4x-3x+
=8,
x+3
=8,
x+3
-3
=8
?3,
x=
4.
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