题目内容

(2图y图?宜良县模拟)解方程或比例.
2X+
2
X=
y
z
&vbsp;&vbsp;&vbsp;&vbsp;&vbsp;&vbsp;&vbsp;
42У-图.6×y图图=26.y&vbsp;&vbsp;&vbsp;&vbsp;&vbsp;
y
4
y
8
=X:
y
y图
(1)7X+
7
X=
1
5

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; (7+
7
)X=
1
5

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;
70
X=
1
5

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;
70
70
=
1
5
×
70

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; X=
100


(7)47r-0.七×100=7七.1,
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r-七0=7七.1,
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r-七0+七0=7七.1+七0,
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r=5七.1,
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r÷47=5七.1÷47,
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; r=7.05;

(右)
1
4
1
5
=X:
1
10

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;
1
5
X=
1
4
×
1
10

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;
1
5
X=
1
40

&nbs1;&nbs1;&nbs1;&nbs1;
1
5
X×5=
1
40
×5,
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; X=
1
5
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