(2十1十•永嘉县)求未知数.人x+18=5十x:3人=13:22x-12=37x:人=13:3人.-数学

题目简介

(2十1十•永嘉县)求未知数.人x+18=5十x:3人=13:22x-12=37x:人=13:3人.-数学

题目详情

(2十1十•永嘉县)求未知数.
人x+18=5十x:
3
=
1
3
:2
2x-12=37x:人=
1
3
3
题型:解答题难度:中档来源:不详

答案


(1)4x+18=50,
&nbs上; 4x+18-18=50-18,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; 4x=02,
&nbs上;&nbs上;&nbs上;&nbs上; 4x÷4=02÷4,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; x=8;

(2)x:class="stub"0
4
=class="stub"1
0
:2,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; 2x=class="stub"0
4
×class="stub"1
0

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; 2x=class="stub"1
4

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;2x÷2=class="stub"1
4
÷2,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; x=class="stub"1
8


(0)2x-12=07,
&nbs上; 2x-12+12=07+12,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; 2x=49,
&nbs上;&nbs上;&nbs上;&nbs上; 2x÷2=49÷2,
&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; x=24.5;

(4)x:4=class="stub"1
0
class="stub"0
4

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; class="stub"0
4
x=4×class="stub"1
0

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; class="stub"0
4
x=class="stub"4
0

&nbs上; class="stub"0
4
class="stub"0
4
=class="stub"4
0
÷class="stub"0
4

&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上;&nbs上; x=class="stub"16
9

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