题目内容
= | = | = | 2.25+= |
= | 2.5×0.1= | 7.5÷0.5= | = |
20.1+9.09= | ×= | -= | 1÷0.1-1×0.1= |
(+)×63= | 0.5÷= | 0.4÷40%= | 0.42-0.32= |
解:
=, | =, | =, | 2.25+=4, |
=16, | 2.5×0.1=0.25, | 7.5÷0.5=15, | =20, |
20.1+9.09=29.19, | ×=, | -=, | 1÷0.1-1×0.1=9.9, |
(+)×63=16, | 0.5÷=2, | 0.4÷40%=1, | 0.42-0.32=0.07. |
分析:20.1+9.09注意小数的位数;1÷0.1-1×0.1先同时运算乘法和除法,最后算减法;(+)×63运用乘法分配律简算;0.42-0.32=0.4×0.4-0.3×0.3,由此求解;
其它题目根据运算法则直接求解.
点评:本题主要考查了简单的分数、小数的四则运算,运用运算法则求解,注意小数的位数,以及把结果化成最简分数.
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