题目内容
解方程.
18-25%x=5.5
x÷(1-15%)=34
x+45%=
.
18-25%x=5.5
x÷(1-15%)=34
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①18-25%x=5.5
18-0.25x+0.25x=5.5+0.25x
5.5+0.25x=18
5.5+0.25x-5.5=18-5.5
0.25x÷0.25=12.5÷0.25
x=50;
②x÷(1-15%)=34
x×
×
=34×
x=28.9;
③
x+45%=
x+0.45-0.45=0.5-0.45
x=0.05
x×
=0.05×
x=0.075;
18-0.25x+0.25x=5.5+0.25x
5.5+0.25x=18
5.5+0.25x-5.5=18-5.5
0.25x÷0.25=12.5÷0.25
x=50;
②x÷(1-15%)=34
x×
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x=28.9;
③
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x=0.075;
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