急!在线等!五年级数学2.3×1.42+0.23×9.8+4.6×3.8巧算~大神快来!
2019-06-27
急!在线等!五年级数学
2.3×1.42+0.23×9.8+4.6×3.8
巧算~大神快来!
优质解答
2.3×1.42+0.23×9.8+4.6×3.8
=2.3×（1.42+0.98）+4.6×3.8
=2.3×2.4+4.6×3.8
=2.3×（2.4+7.6）
=2.3×10
=23
2.3×1.42+0.23×9.8+4.6×3.8
=2.3×（1.42+0.98）+4.6×3.8
=2.3×2.4+4.6×3.8
=2.3×（2.4+7.6）
=2.3×10
=23