6.5×1.9–65×0.9
=6.5×1.9–6.5×9
=6.5×(1.9–9)
=6.5×(–7.1)
=–46.15
是不是把题目写错了？
6.5×1.9-65×0.9
＝6.5×1.9-6.5×9
＝6.5×（1.9-9）
＝6.5×－7.1
＝6.5×（-7-0.1）
＝-7×6.5-0.1×6.5
＝－45.5－0.65
＝－46.15
6.5X1.9-65X0.9
=6.5X2-6.5X0.1-65X1+65X0.1
=13-0.65-65+6.5
=-(65-19)-(0.65-0.5)
=-46-0.15
=-46.15
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