问题
解答题
求未知数X的值: ①3.2X-4×
②24:X=9:5 ③X:18=54:3 ④0.5X-
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答案
(1)3.2X-4×
=1 4
,1 5
3.2X-1=
,1 5
3.2X-1+1=
+1,1 5
3.2X÷3.2=1.2÷3.2,
x=0.375;
(2)24:X=9:5,
9X=24×5,
9X÷9=120÷9,
X=13
;1 3
(3)X:18=54:3,
3X=18×54,
3X÷3=972÷3,
X=324;
(4)0.5X-
=1.625,7 8
0.5X-
+7 8
=1.625+7 8
,7 8
0.5X÷0.5=2.5÷0.5,
X=5.