Question

20 баллов! Вычислите рассуждая по образцуОбразец 40x20=(4x10)x(2x10)=(4x2)x(10x10)=8x100=80030x20 б)600х70 в)60х30 г)3000х30 д)9х400 е)500х2000

Answer 1

30*20= (3*10)*(2*10)= (3*2)*(10*10)=6*100=600
600*70=(6*100)*(7*10)=(6*7)*(100*10)= (42*1000)=42000
60*30=(6*10)*(3*10)=(6*3)*(10*10)=18*100=1800
3000*30=(3*1000)*(3*10)=(3*3)*(1000*10)=9*10000=90000
9*400=(4*100)=9*4*100=36*100=3600
500*2000=(5*100)*(2*1000)=(2*5)*(100*1000)=10*100000=1000000

Answer 2

a) 30x20 = (3x10)x(2x10) = 3x2x100 = 600 b) 600x70 = 60x10x7x10 = 4200x10 = 42000 c) 60x30 = 6x10x3x10 = 18x100 = 1800 d) 3000x30 = 3x1000x3x10 = 9000x10 = 90000 e) 9x400 = 9x4x100 = 36x100 = 3600 f) 500x2000 = 5x100x20x100 = 100x2000 = 200000

Итак, a) 30x20 = 600 b) 600x70 = 42000 c) 60x30 = 1800 d) 3000x30 = 90000 e) 9x400 = 3600 f) 500x2000 = 200000