1054-387-113的简便运算。 499+387+113简便计算?
\u7b80\u4fbf\u8ba1\u7b97;14*99 302*112 1054-387-113 4*8*125*250 7.5*5\u53c86\u5206\u4e4b5+7 .5*1/56 -7.5 0.63*2.5+0.063*7514*99=14*100-14=1386 302*112=300*112+2*112=33600+224=33824 1054-387-113=1054-(387+113)=1054-500=554 4*8*125*250=(4*250)(8*125)=1000*1000=1000000 0.63*2.5+0.063*75=0.063*10*2.5+0.063*75=0.063\uff0825+75\uff09=0.063*100=6.3
7.5*5\u53c86\u5206\u4e4b5+7.5*5\u53c86\u5206\u4e4b1-7.5=7.5*\uff085\u53c86\u5206\u4e4b5+5\u53c86\u5206\u4e4b1-1\uff09=7.5*10=75
499\uff0b387\uff0b113\u7b80\u4fbf\u8ba1\u7b97\uff1f
499\uff0b387\uff0b113
=499+1+387+113-1
=500+500-1
=999
解:运用结合律的简便方法,
原式=1054-(387+113)
=1054-500
=554
图
1054-387-113
=1054-(387+113)
=1054-500
=554
1054-(387+113)
=1054-500
=554
绛旓細1054-387-113鐨勭畝渚胯繍绠椼傝В锛氳繍鐢ㄧ粨鍚堝緥鐨勭畝渚挎柟娉曪紝鍘熷紡=1054-锛387+113锛=1054-500 =554
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