5.5x4-4.5÷0.25
=5.5x4-4.5÷(1/4)
=5.5x4-4.5x4
=(5.5-4.5)x4
=1x4
=4。
简便计算
4.6×1.25+5.4÷4
=4.6×5/4+5.4×1/4
=23×1/4+5.4×1/4
=（23+5.4）×1/4
=28.4×1/4
=7.1
5.5x4-4.5÷0.25
=5.5x4-4.5x100÷25
=5.5x4-4.5x4
=5x4x（1.1-0.9）
=20x0.2
=4
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