Х+120=40•5
Х+120=200
Х=200-120
Х=80
___________
80+120=40•5
200=200
х+20=40•5
Х+20=200
Х=200-20
Х=180
___________
180+20=40•5
200= 200
Х•5=240
Х=240:5
Х=48
_________
48•5=240
5 х 90 + 6 Х 9 = 450+54 = 504
40 х 9 - 81 / 9 = 360-9 = 351
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
80%100*3=2.4
60%100*12=7.2
4%100*5=2
90%100*60=54
1,63х=340
х=340:1 63/100
х=340:163/100
х=340*100/163
х=34000/163
х=208 96/163