1.用简便方法计算:99又17/18 × (﹣9) 2.﹣4 - [﹣5 +﹙0.2 × 1/3 - 1﹚ ÷ ﹙﹣1又2/5﹚] 3.|﹣9/41| - |﹣13/14| + |9/41 - 13/14| 注:| | 为绝对值的符号
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![1.用简便方法计算:99又17/18 × (﹣9) 2.﹣4 - [﹣5 +﹙0.2 × 1/3 - 1﹚ ÷ ﹙﹣1又2/5﹚] 3.|﹣9/41| - |﹣13/14| + |9/41 - 13/14| 注:| | 为绝对值的符号](/uploads/image/z/2764866-66-6.jpg?t=1.%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A99%E5%8F%8817%2F18+%C3%97+%28%EF%B9%A39%29+2.%EF%B9%A34+%EF%BC%8D+%5B%EF%B9%A35+%EF%BC%8B%EF%B9%990.2+%C3%97+1%2F3+%EF%BC%8D+1%EF%B9%9A+%C3%B7+%EF%B9%99%EF%B9%A31%E5%8F%882%2F5%EF%B9%9A%5D+3.%7C%EF%B9%A39%2F41%7C+%EF%BC%8D+%7C%EF%B9%A313%2F14%7C+%EF%BC%8B+%7C9%2F41+%EF%BC%8D+13%2F14%7C+%E6%B3%A8%EF%BC%9A%7C+%7C+%E4%B8%BA%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%9A%84%E7%AC%A6%E5%8F%B7)
1.用简便方法计算:99又17/18 × (﹣9) 2.﹣4 - [﹣5 +﹙0.2 × 1/3 - 1﹚ ÷ ﹙﹣1又2/5﹚] 3.|﹣9/41| - |﹣13/14| + |9/41 - 13/14| 注:| | 为绝对值的符号
1.用简便方法计算:99又17/18 × (﹣9) 2.﹣4 - [﹣5 +﹙0.2 × 1/3 - 1﹚ ÷ ﹙﹣1又2/5﹚] 3.|﹣9/41| - |﹣13/14| + |9/41 - 13/14| 注:| | 为绝对值的符号
1.用简便方法计算:99又17/18 × (﹣9) 2.﹣4 - [﹣5 +﹙0.2 × 1/3 - 1﹚ ÷ ﹙﹣1又2/5﹚] 3.|﹣9/41| - |﹣13/14| + |9/41 - 13/14| 注:| | 为绝对值的符号
用简便方法计算:
99又17/18 × (﹣9)
=-(100-1/18)*9
=-900 +1/2
=-899又1/2
2.﹣4 - [﹣5 +﹙0.2 × 1/3 - 1﹚ ÷ ﹙﹣1又2/5﹚]
=-4+5+14/15*5/7
=1+2/3
=5/3
3.|﹣9/41| - |﹣13/14| + |9/41 - 13/14|
=9/41-13/14+13/14-9/41
=0