问题
解答题
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答案
①30%x+15=18
0.3x+15-15=18-15
0.3x=3
0.3x÷0.3=3÷0.3
x=10;
②80%x+10%x=27
0.9x=27
0.9x÷0.9=27÷0.9
x=30;
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①30%x+15=18
0.3x+15-15=18-15
0.3x=3
0.3x÷0.3=3÷0.3
x=10;
②80%x+10%x=27
0.9x=27
0.9x÷0.9=27÷0.9
x=30;