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375–298=、296*25=、(343+685+157)–585=

题目详情
375–298=、296*25=、(343+685+157)–585=
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答案和解析
375–298
=375-(300-2)
=375-300+2
=75+2
=77
296*25
=(300-4)x25
=300x25-25x4
=7500-100
=7400
(343+685+157)–585
=343+685+157–585
=(343+157)+(685-585)
=500+100
=600