Question

Efectuează:
69×100-(25×10)×2=
85×100-(47×10+362)×3=
( 572+45×100)-36×10=

Answer 1

6900-250×2=
=6900-500=6400

8500-(470+362)×3=
=8500-832×3
=8500-2496=6004

(572+4500)-360=
=5072-360=4712

Answer 2

6900-250×2≈ 6900-500≈6400

8500-(470+362)×3≈ 8500-932×3≈ 8500-2796≈ 5704

(572+4500)-360≈ 5072-360≈4712