四年级简便计算递等式:798-(346-282)-654

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四年级简便计算递等式:798-(346-282)-654
四年级简便计算递等式:798-(346-282)-654

四年级简便计算递等式:798-(346-282)-654
798-(346-282)-654
=798-346+282-654
=798+282-(346+654)
=1080-1000
=80

798-(346-282)-654
=798-346+282-654
=(798+282)-(346+654)
=1080-1000
=80

原式=798+282-(346+654)
=1000-1000
=0

798-(346-282)-654
=798-346+282-654
=(798+282)-(346+654)
=1080-10100
=80