2. B 3. A 4. C 三、计算。 1.直接写出得数。 24 10 0.5 0.027 3
2.计算下面各题,能简算的要简算。 1050÷7-24x4 =150-96 =54 10.5-6.25-3.75+7.5 =(10.5+7.5)-(6.25+3.75) =18-10 =8
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=
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=12 〔Www.PuxueWang.com〕 56x(1+ =56×
=77x(1+
=77x1+77x =77+44
=121
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= =
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=3+6-4 =5 (本答案来自普学网 www.puxue.com) 3. 解方程。
解:
x=30 5x+12.9=37.9 解:5x=25 x=5 |