109. 1)(49+51)*362=100*362=36200. 2)(658-657)*29=1*29=29. 3)394(268+232)=394*500=197000. 4) 64(258-39-19)=64*200=12800. 107. 20a*5b=5(4a*b)=5(4*48*4)=5*768=3840. 108.4(x-8)=4x-32. 8*(x+3)=8x+24. (7-x) 8=56-8x. (4a-c) *12=48a-12c. 9(3a-7b+8c)=27a-63b+72c. (5x+8y-3k)12=60x+96y-36k. 110. 1)289*36+711*36=(289+711)36=1000*36=36000. 2) 968*43-68*43=(968-68)43=900*43=38700. 111. 1)14x. 2)11y. 3)29a. 4)88m. 5)41x. 6)22y. 7)55k-14. 8)83b+18. 9)34c
A) 800 : 10=80
б)20*10=200
<em>1)12*х=112,8...х=112,8:12...х=9,4 ; 2)178,5:х=21...х=178,5:21...х=8,5 ; 3)х:3,2=10,5...х=10,5*3,2...х=33,6 ; 4)у+27у=0,952...28у=0,952...у=0,952:28...у=0,034 ; 5)33т-т=102,4...32т=102,4...т=102,4:32...т=3,2 ; 6)2,7х-1,3х+3,6х=2...1,4х+3,6х=2...5х=2...х=2:5...х=0,4</em><em></em><em /><em /><em></em>
Ab=12 см12*2/3=8 см - длина CD
1. х=7,19-5,14=2,05
2. 3,6-х=13,6+4,9
х=3,6-13,6-4,9=-14,9