解方程.x×(1-49)=56x+79x=211x-50%=16(x+27)×40%=8.-数学

题目简介

解方程.x×(1-49)=56x+79x=211x-50%=16(x+27)×40%=8.-数学

题目详情

解方程.
x×(1-
4
9
)=
5
6

x+
7
9
x=2

11x-50%=16
(x+
2
7
)×40%=8.
题型:解答题难度:中档来源:不详

答案

(1)x×(1-class="stub"4
9
)=class="stub"5
6

class="stub"5
9
x=class="stub"5
6

class="stub"5
9
class="stub"9
5
=class="stub"5
6
×class="stub"9
5

x=class="stub"3
2

(2)x+class="stub"7
9
x=2,
class="stub"16
9
x=2,
class="stub"16
9
class="stub"9
16
=2×class="stub"9
16

x=class="stub"9
8


(3)11x-50%=16
11x-50%+50%=16+50%,
11x=16.5,
11x÷11=16.5÷11,
x=1.5;

(4)(x+class="stub"2
7
)×40%=8,
(x+class="stub"2
7
)×40%÷40%=8÷40%,
x+class="stub"2
7
=20,
x+class="stub"2
7
-class="stub"2
7
=20-class="stub"2
7

x=19class="stub"5
7

更多内容推荐