等于负45.72
4.28×6－14.28×5
＝4.28×（6－5）－10×5
＝4.28－50
＝－45.72
4.28x6一14.28×5
=4.28x6一(10十4.28)×5
=(4.28x6一4.28x5)一10x5
=4.28x(6一5)一50
=4.28x1一50
=4.28一50
=一45.72
4.28x6一14.28x5=4.28x6一(10+4.28)x5=4.28x6一50一4.28x5=4.28(6一5)一50=4.28一50=一45.72
4.28×6-14.28×5
=4.28×6-71.4
=6×（4.28-11.9）
=6×（7.62）=45.72
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