Question

помогите решить только 23

Answer 1

1) 2.71*12.6+87.4*2.71=2.71*(12.6+87.4)=2.71*100=271

2) 20.8*17.9-20.8*7.9=20.8*(17.9-7.9)=20.8*10=208

3) 3.08*17.9-3.08*7.9=3.08*(17.9-7.9)=3.08*10=30.8

4) 7.5*8.7+2.5*(9.4-2.7)=7.5*8.7+2.5*6.7=2.5*3*8.7+2.5*6.7=2.5*(3*8.7+6.7)=2.5*32.8=82