问题 解答题
解方程
8
9
+
1
9
x=2
5.4x+2.6x=8401.75x÷14=0.5.
答案

(1)

8
9
+
1
9
x=2,

8
9
+
1
9
x-
8
9
=2-
8
9

1
9
x=
10
9

1
9
x×9=
10
9
×9,

x=10;

(2)5.4x+2.6x=840,

(5.4+2.6)x=840,

8x=840,

8x÷8=840÷8,

x=105;

(3)1.75x÷14=0.5,

1.75x÷14×14=0.5×14,

1.75x=7,

1.75x÷1.75=7÷1.75,

x=4.

单项选择题
单项选择题