5.8Ⅹ4.2+5.8X3.8-4.8Ⅹ3.5+4.5
=5.8X(4.2+3.8)-2.4X2X3.5+4.5
=5.8X8-2.4X7+4.5
=5.8X8-8X0.3X7+4.5
=8X(5.8-2.1)+4.5
=8X3.7+4.5
=29.6+4.5
=34.1
望采纳，谢谢
5.8×4.2+5.8×3.8−4.8×3.5+4.5
=5.8×(4.2+3.8)−4.8×3.5+4.5
=5.8×8−4.8×3.5+4.5
=46.4−16.8+4.5
=29.6+4.5
=34.1
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