问题
解答题
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答案
(1)2x+2.7=24.7
2x+2.7-2.7=24.7-2.7,
2x=22,
2x÷2=22÷2,
x=11;
(2)x-0.2x=5.6
x(1-0.2)=5.6,
0.8x=5.6,
0.8x÷0.8=5.6÷0.8,
x=7;
(3)2.5:5=
:x1 2
2.5x=5×
,1 2
2.5x÷2.5=
÷2.5,5 2
x=1.
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(1)2x+2.7=24.7
2x+2.7-2.7=24.7-2.7,
2x=22,
2x÷2=22÷2,
x=11;
(2)x-0.2x=5.6
x(1-0.2)=5.6,
0.8x=5.6,
0.8x÷0.8=5.6÷0.8,
x=7;
(3)2.5:5=
:x1 2
2.5x=5×
,1 2
2.5x÷2.5=
÷2.5,5 2
x=1.