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11 原式=89又6分之5x12
=(89+5/激族6)x12
=(90-1/基搭6)x12
=90x12-(1/6)x12
=1080-2
=1078
12 原式=(-2/63)÷(4/9-6/9)
=(-2/搏铅拿63)÷(-2/9)
=(2/63)÷(2/9)
=(2/63)x(9/2)
=1/7
=(89+5/激族6)x12
=(90-1/基搭6)x12
=90x12-(1/6)x12
=1080-2
=1078
12 原式=(-2/63)÷(4/9-6/9)
=(-2/搏铅拿63)÷(-2/9)
=(2/63)÷(2/9)
=(2/63)x(9/2)
=1/7
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11
原式=89又6分之5x12
=(89+5/6)x12
=(90-1/6)x12
=90x12-(1/6)x12
=1080-2
=1078
12
原式=(-2/63)÷(4/9-6/9)
=(-2/63)÷(-2/9)
=(2/饥大或核63)÷(2/烂团竖9)
=(2/63)x(9/2)
=1/7
原式=89又6分之5x12
=(89+5/6)x12
=(90-1/6)x12
=90x12-(1/6)x12
=1080-2
=1078
12
原式=(-2/63)÷(4/9-6/9)
=(-2/63)÷(-2/9)
=(2/饥大或核63)÷(2/烂团竖9)
=(2/63)x(9/2)
=1/7
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