Question

вычисли удобным  способо

70*20+70*130=

150*100+250*100=

910*17+17*90=

Answer 1

70*20+70*130=70(20+130)=70*150=10 500

150*100+250*100= 100(150+250)=100*400=40 000

910*17+17*90=17(910+90)=17*1000=17 000

   

Answer 2

70*20+70*30=70*(20+130)=70*150=3500

150*100+250*100=100*(150+250)=100*350=35000 

910*17+17*90=17*(910+90)=17*1000=17000