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简算 28+120x8 730-230*10+42 420x15*21+51 (75+360)*(20-5)
简算 28+120x8
730-230除以10+42
420x15除以21+51
(75+360)除以(20-5)
人气:427 ℃ 时间:2020-06-23 19:58:41
解答
28+120×8 730-230÷10+42 420×15÷21+51 (75+360)÷(20-5)
=7×4+240×4 =730-23+42 =420÷21×15+51 =(75+360)÷15
=(7+240)×4 =730+42-23 =20×15+51 =75÷15+360÷15
=247×4 =772-23 =300+51 =5+24
=988 =749 =351 =29
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