2) KL² =NL*LM² NL =x LM=MN -NL =25 -x;
144 =x(25 -x) ;
x² -25x +144 =0;
x = 9
x=16 (по рисунку NL < LM )
ΔKLN : NK² =NL²+ LK²
NK =3*5 =15 (9 =3*3; 12=3*4; 3*5=15)..
ΔKLM : KM² =KL² +LM²
KM =4*5 =20 (12 =4*3; 16=4*4 ;4*5 =20)
3) KE² =EM*EL
EM =KE²/EL =6²/8 =9/2 =4,5
KL² =KE² +EL² =6² +8² =100 =10²
KL =10.
KL² =ML*EL
ML =KL²/EL =100/8 =12,5.;
( 5/EM = ML --EL =12,5 -8 =4,5)
MK² =ML*ME;
MK² =12,5*4,5 =25*0,5*0,5*9;
MK =5*0,5*3 =7,5.
4) MN² =MK² +KN² =5² +²12² =25 +144 =169 =13²;
MN =13;
MK² =MN*MT ;
MT =MK²/MN=5²/13 =25/13.
NT =MN -MT =13 -25/13 =144/13;
KT² =MT*NT=25/13*144/13 =(5*12/13)² ;
KT =5*12/13 =60/13.
или из ΔMTK :
KT² =MK² -MT²² =5² -(25/13)² =(5 -25/13)(5+25/13) =40/13*90/13 =(2*3*10/13)²;
KT =2*3*10/13 =60/13 .
13 440:32:7+7*123=921
1)13440:32=420
2).420:7=60
3)123*7=861
4)861+60=921
8573-4 422 2 - 1 567 =4794
1)4422:2=2211
2)8572-2211=6361
3) 6363-1567=4794
7924 – 5 832:2 - 3 822=1186
1.5 832 : 2 = 2916
2. 7924- 2 916=5 008
3. 5 008 - 3 822= 1186
(8535-1579):4+3456 =5195
1) 8535-1579=6956
2) 6956:4=1739
3) 3456+1739=5195
(12 789 - 8 845) 4 + 26 922=
1)12789-8845=3944
2)3944/4=986
3)26922+986=27908
509 603 - 999 999 11 3982=31591
509*603＝320670
999999:11＝999
3982+999＝4881
320670-4881＝31591