问题
解答题
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答案
(1)
x+2 3
x=63,1 2
x=63,7 6
x÷7 6
=63÷7 6
,7 6
x=54;
(2)7x-25=13.5,
7x-25+25=13.5+25,
7x÷7=38.5÷7,
x=5.5;
(3)
=1.2 7.5
,0.4 x
1.2x=7.5×0.4,
1.2x÷1.2=3÷1.2,
x=2.5.
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(1)
x+2 3
x=63,1 2
x=63,7 6
x÷7 6
=63÷7 6
,7 6
x=54;
(2)7x-25=13.5,
7x-25+25=13.5+25,
7x÷7=38.5÷7,
x=5.5;
(3)
=1.2 7.5
,0.4 x
1.2x=7.5×0.4,
1.2x÷1.2=3÷1.2,
x=2.5.