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求未知数1.0.85X+8=15.5-2.15X2.3/7:1/3=X:3/4
题目详情
求未知数
1.0.85X+8=15.5-2.15X
2.3/7:1/3=X:3/4
1.0.85X+8=15.5-2.15X
2.3/7:1/3=X:3/4
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答案和解析
1.0.85X+8=15.5-2.15X
0.85X+8=15.5-2.15X
0.85X+2.15X=15.5-8
3X=7.5
X=2.5
2.3/7:1/3=X:3/4
3/7:1/3=X:3/4
3/7×3/4=X×1/3
X=3/7×3/4÷1/3
X=9/28÷1/3
X=27/28
0.85X+8=15.5-2.15X
0.85X+2.15X=15.5-8
3X=7.5
X=2.5
2.3/7:1/3=X:3/4
3/7:1/3=X:3/4
3/7×3/4=X×1/3
X=3/7×3/4÷1/3
X=9/28÷1/3
X=27/28
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