29×16+58×42等于多少用简便运算

29×16+58×42等于多少用简便运算
2025-02-23 00:54:45
推荐回答(2个)
回答1:

29×16+58×42
=29×16+29×2×42
=29×16+29×84
=29×(16+84)
=29×100
=2900

回答2:

29×16+58×42
=29×16+29×2×42
=29×16+29×84
=29×(16+84)
=29×100
=2900
29×16+58×42
=(30-1)×16+(60-2)×42
=30×16-16+60×42-2×42
=480-16+2520-84
=(480+2520)-(16+84)
=3000-100
=2900