求未知数X (1)1/8X减1=0.2 (2)X/28=0.1/0.8
1个回答
(1):1/8X-1=0.2
X-8=1.6
X=9.6
(2)X/28=0.1/0.8
X/28=1/8
2X=7(两边同时*56)
X=3.5
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