t2 2t-35=0用因式分解法怎么做
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t” + 2t - 35 = 0,
t” + 7t - 5t - 35 = 0,
t( t + 7 ) - 5( t + 7 ) = 0,
( t - 5 )( t + 7 ) = 0,
或者
t” - 5t + 7t - 35 = 0,
t( t - 5 ) + 7( t - 5 ) = 0,
( t - 5 )( t + 7 ) = 0,
或者
t” + 2t + 1 - 36 = 0,
( t + 1 )” - 6” = 0,
( t + 1 - 6 )( t + 1 + 6 ) = 0,
( t - 5 )( t + 7 ) = 0,
解方程得,
t1 = 5,
t2 = -7,
t” + 7t - 5t - 35 = 0,
t( t + 7 ) - 5( t + 7 ) = 0,
( t - 5 )( t + 7 ) = 0,
或者
t” - 5t + 7t - 35 = 0,
t( t - 5 ) + 7( t - 5 ) = 0,
( t - 5 )( t + 7 ) = 0,
或者
t” + 2t + 1 - 36 = 0,
( t + 1 )” - 6” = 0,
( t + 1 - 6 )( t + 1 + 6 ) = 0,
( t - 5 )( t + 7 ) = 0,
解方程得,
t1 = 5,
t2 = -7,
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