问题
解答题
求未知数x ①0.36×5-2x=0.4 ②
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答案
(1)0.36×5-2x=0.4,
1.8-2x=0.4,
1.8-2x+2x=0.4+2x,
0.4+2x-0.4=1.8-0.4,
2x÷2=1.4÷2.
x=0.7;
(2)
=18 x
,7.2 8
7.2x=18×8,
7.2x÷7.2=144÷7.2,
x=20.
求未知数x ①0.36×5-2x=0.4 ②
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(1)0.36×5-2x=0.4,
1.8-2x=0.4,
1.8-2x+2x=0.4+2x,
0.4+2x-0.4=1.8-0.4,
2x÷2=1.4÷2.
x=0.7;
(2)
=18 x
,7.2 8
7.2x=18×8,
7.2x÷7.2=144÷7.2,
x=20.