直接写出得数 + = | ÷ = | ÷ = | + × = |
× = | 12× = | × = | 21÷ -84= |
12× × = | ÷ = | ÷4= | + ÷2= |
+ = , | ÷ = , | ÷ = , | + × =1 , |
× = , | 12× =10, | × = , | 21÷ -84=0, |
12× × = , | ÷ = , | ÷4= , | + ÷2= . |
分析:
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×
先算乘法,再算加法;21÷
-84先算除法,再算减法;12×
×
运用乘法结合律简算;
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÷2先算除法,再算加法;其它题目根据运算法则直接求解.点评:本题考查了基本的运算,混合运算要注意运算的顺序,要把结果化成最简分数.
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