7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8)7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8) -9除以3+(1/2-2/3)x12+3的2次方用简便方法算_
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![7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8)7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8) -9除以3+(1/2-2/3)x12+3的2次方用简便方法算_](/uploads/image/z/992952-0-2.jpg?t=7%2F9x%28-8%2F9%29%2B2%2F9x%28-8%2F9%29+2%2F3x%28-5%2F8%29-%28-1%2F3%29x%28-5%2F8%297%2F9x%28-8%2F9%29%2B2%2F9x%28-8%2F9%29+2%2F3x%28-5%2F8%29-%28-1%2F3%29x%28-5%2F8%29+-9%E9%99%A4%E4%BB%A53%2B%281%2F2-2%2F3%29x12%2B3%E7%9A%842%E6%AC%A1%E6%96%B9%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E7%AE%97_)
7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8)7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8) -9除以3+(1/2-2/3)x12+3的2次方用简便方法算_
7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8)
7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8) -9除以3+(1/2-2/3)x12+3的2次方用简便方法算_
7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8)7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8) -9除以3+(1/2-2/3)x12+3的2次方用简便方法算_
7/9x(-8/9)+2/9x(-8/9)=(-8/9)×(7/9+2/9)=-8/92/3x(-5/8)-(-1/3)x(-5/8)=(-5/8)× (2/3+1/3)=-5/8-9÷[3+(1/2-2/3)x12+3 ²]=-9÷[3+(-4)+9] =9/8