题目内容
解方程
x-
x+
=
:x=80%:
70%x+20%x=3.6
4x-6=38.
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70%x+20%x=3.6
4x-6=38.
(1)
x-
x+
=
,
x+
=
,
x+
-
=
-
,
x=
,
x÷
=
÷
,
x=3;
(2)
:x=80%:
,
80%x=
×
,
80%x=
,
80%x÷80%=
÷80%,
x=
;
(3)70%x+20%x=3.6,
90%x=3.6,
90%x÷90%=3.6÷90%,
x=4;
(4)4x-6=38,
4x-6+6=38+6,
4x=44,
4x÷4=44÷4,
x=11.
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x=3;
(2)
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80%x=
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80%x=
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80%x÷80%=
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x=
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(3)70%x+20%x=3.6,
90%x=3.6,
90%x÷90%=3.6÷90%,
x=4;
(4)4x-6=38,
4x-6+6=38+6,
4x=44,
4x÷4=44÷4,
x=11.
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