两道中二数学题(用十字相乘法)1.(3p+2)(p-3)+4p2.5(3w-1)^2+29(3w-1)-6
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两道中二数学题(用十字相乘法)1.(3p+2)(p-3)+4p2.5(3w-1)^2+29(3w-1)-6
两道中二数学题(用十字相乘法)
1.(3p+2)(p-3)+4p
2.5(3w-1)^2+29(3w-1)-6
两道中二数学题(用十字相乘法)1.(3p+2)(p-3)+4p2.5(3w-1)^2+29(3w-1)-6
1.(3p+2)(p-3)+4p
=3p^2-7p-6+4p
=3p^2-3p-6
=3(p^2-p-2)
=3(p-2)(p+1)
2.5(3w-1)^2+29(3w-1)-6
=[5(3w-1)-1][(3w-1)+6]
=(15w-5-1)(2w-1+6)
=(15w-6)(2w+5)
=3(5w-2)(2w+5)
拆开不就行了!
1原式=3p^2-3p-6=3(p-2)(p+1)
2原式=45w^2+57w-30=3(3w+5)(5w-2)