Question

вычислить удобным способом 0.2+0.4+0.6+0.8+1+1.2 деленная на 1.2+1.4+1.6+1.8+2+2.2+2.4+2.6+2.8+3

Answer 1

0.2+0.4+0.6+0.8+1+1.2=(0.2+0.8)+(0.4+0.6)+(1+1.2)=1+1+2,2=4,2
1.2+1.4+1.6+1.8+2+2.2+2.4+2.6+2.8+3=(1.2+1.8)+(1.4+1.6)+(2+3)+(2.2+2.8)+(2.4+2.6)=3+3+5+5+5=21