问题
解答题
解下列方程.
x+20×
x+
|
答案
(1)
x=7 8 21 40
x÷7 8
=7 8
÷21 40 7 8
x=3 5
(2)
x÷1 3
=84 5
x÷1 3
×4 5
=8×4 5 4 5
x=1 3 32 5
x÷1 3
=1 3
÷32 5 1 3
x=96 5
(3)x+20×
=191 4
x+5=19
x+5-5=19-5
x=14
(4)x+
X=427 8
(1+
)X=427 8
X=4215 8
X÷15 8
=42÷15 8 15 8
X=112 5