初中函數(shù)知識(shí)點(diǎn)總結(jié)非常全

x點(diǎn)Px點(diǎn)Pyx點(diǎn)P點(diǎn)xyyxxyyx2y2abx與xx是x點(diǎn)xy0點(diǎn)xy0點(diǎn)xy0點(diǎn)xy0點(diǎn)xy0點(diǎn)yx0點(diǎn)xyP點(diǎn)x與y相等點(diǎn)x與yxyxy1bxy隨xxybyk的b的yyy隨x0x隨x隨xyb隨x隨xy隨xxybyk和ky隨xyxx或xx012xyxyaxbxc(a,b,c是常數(shù)，a0)ayx2yaxbxc(a,b,c是常數(shù)，a0)2ky數(shù)xbx2ayxOxyaxbxc2xyCxyCD隨x隨xyax2ykaxkk0隨0隨yxxyx0y0．xy(k0)P作x00y軸xk?y?x。yxyk,Sk。xx0y隨0y隨000y軸xaxx0y0．3240xbyaxc2ayaxcyax22y隨0y隨axxa00cy軸0y．xxcxx0y隨0y隨xx0ca0y軸0y．xxcyaxh24bxb2y。yaxhyax222a4aaxxxb2a12xhy隨yxxha0a00h4b2隨時(shí)，y0．bxxhxxxy2a4a12xhy隨xxhyh0隨xh時(shí)，y0．xxxx隨xxx122yaxhk2yax22bxcxxyaxbxc隨x21最大21最小1xxyax21bxcxxyax22bxc。a1最大12最小2xhy隨yxxha0a0kh隨時(shí)，y．xhxkxhy隨xxhy隨xxh時(shí)，yk．hkyaxbxc（，，a02abcya(xh)k（，h，ka02aya(xx)(xx)（a0，x，xx12124xax2020cyaxbxcyxyax2①當(dāng)40Ax0Bx0()，是b2xxxxx121212b42ax2bxc0a0xx21ayyyaxc0bxc與xAx0，Bx0、是x2x12122bcxx,xx12a12a224cb24ac0x0xABxxxxxx4xx212121212aaaa②當(dāng)0x③當(dāng)0xbb，，1'當(dāng)a0xxy0；2'當(dāng)a0xxy0．x2b42xbb當(dāng)xx2a隨當(dāng)xybbAB）2bb112則x2212124b24ayy4aB5cyaxbxcy與22①yaxhkhk；當(dāng)x0ycyaxbxc與yc2②yax2hk①c0向上(k>0)【或向下(k<0)】平移|k個(gè)單位②c③c0y0y向右(h>0)【或左(h<0)】平移k|個(gè)單位向右(h>0)【或左(h<0)】平移k|個(gè)單位向右(h>0)【或左(h<0)】平移k|個(gè)單位by0.向上(k>0)【或下(k<0)】平移|k個(gè)單位a()2()2y=ax-h+k向上(k>0)【或下(k<0)】平移|k個(gè)單位hkⅠ3ⅠⅠⅡⅡyyktan21xx21ly若lllkk//ykxb//lkxbl111222121212Ⅱ且bb。若llkk