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2×5= 4.2-1.8= 12.5×8= 3.54×10=
70×50= 2.15+1.85= 0÷0.25= 2÷0.4=
9÷6= 7x-2.8x=
分析:(1)、(5)、(9)根据整数乘除法的计算法则计算,(2)、(6)、(10)根据小数加减法的计算法则计算,(3)、(4)、(7)、(8)根据小数乘除法的计算法则进行计算;据此可解答.
解答:
解:2×5=10, 4.2-1.8=2.4, 12.5×8=100, 3.54×10=35.4,
70×50=3500, 2.15+1.85=4, 0÷0.25=0, 2÷0.4=5,
9÷6=1.5, 7x-2.8x=4.2x.
故答案为:10,2.4,100,35.4,3500,4,0,5,1.5,4.2x.
点评:本题考查了学生基本的计算能力.注意本题中含字母的式子7x-2.8x的算法.
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