5.6+17.2×2.5
=5.6+17.2÷4×10
=5.6+4.3×10
=5.6+43
=48.6
5.6+17.2x2.5
=5.6+4.3x4x2.5
=5.6+4.3x10
=5.6+43
=48.6
谢谢，请采纳
=2x2.8+(20-2.8)x2.5
=2x2.8+50-2.8x2.5
=50-2.8x(2.5-2)
=50-1.4
=48.6
=5.6+18*2.5-0.8*2.5
=5.6+45-2
=5.6+43
=48.6
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