
求未知数x①427+x=89②2.1:7=3:x③23
求未知数x①427+x=89②2.1:7=3:x③23x-25x=45④9.5-3x=5.9....
求未知数x①427+x=89②2.1:7=3:x③23x-25x=45④9.5-3x=5.9.
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①
+x=
,
+x-
=
-
,
x=
;
②2.1:7=3:x,
2.1x=7×3,
2.1x÷2.1=21÷2.1,
x=10;
③
x-
x=
,
(
-
)x=
,
x=
,
x×
=
×
,
x=3;
④9.5-3x=5.9,
9.5-3x+3x=5.9+3x,
5.9+3x=9.5,
5.9+3x-5.9=9.5-5.9,
3x=3.6,
3x÷3=3.6÷3,
x=1.2.
4 |
27 |
8 |
9 |
4 |
27 |
4 |
27 |
8 |
9 |
4 |
27 |
x=
20 |
27 |
②2.1:7=3:x,
2.1x=7×3,
2.1x÷2.1=21÷2.1,
x=10;
③
2 |
3 |
2 |
5 |
4 |
5 |
(
2 |
3 |
2 |
5 |
4 |
5 |
4 |
15 |
4 |
5 |
4 |
15 |
15 |
4 |
4 |
5 |
15 |
4 |
x=3;
④9.5-3x=5.9,
9.5-3x+3x=5.9+3x,
5.9+3x=9.5,
5.9+3x-5.9=9.5-5.9,
3x=3.6,
3x÷3=3.6÷3,
x=1.2.
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