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【简答题】
小华买2枝铅笔和7本练习本，共付4.2元，每枝铅笔售价0.35元，每本练习本售价多少元？如果假设每本练习本售价x元，列方程是______．
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】How exactly, does science work How do scientists go about doing science Ordinarily we think science proceeds in a straight-forward way. Ideally scientists make observations, formulate hypotheses (假设),...
A.
The research methods used by scientists.
B.
Observation and human perception variation.
C.
The relation between hypothesis and observation.
D.
The human perceptual mechanism.
【单选题】在Excel中，假设B1、B2、C1、C2单元格中分别存放1、2、6、9，SUM(B1：C2)和AVERAGE(B1，C2)的值等于()。
A.
18，5
B.
10，5
C.
18，10
D.
10，10