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1、加、减、乘、除四种运算称为四则运算。,（一级运算）,加减混合运算：从左往右依次运算；,乘除混合运算：从左往右依次运算；,同级混合运算：从左往右依次运算；,（二级运算）,不同级混合运算的规律：,先算乘除法，再算加减法（先乘除，后加减）,同级运算：从左往右依次运 算；,有括号先算括号里面的。,32+14-8 25-12+45 35-6-12 =46-8 =13+45 =29-12 =38 =58 = 17 362 468 4889 =182 =248 =69 =9 =3 =54,8 15 21 23,22 29 35 37,3 5 7 9,15 25 35 45,34-17+3 =17+3 =20
2、,1833 =63 =18,56+13 45-47 19-486 =30+13 =45-28 =19-8 =43 =17 =11 459+14 842 64-408 =5+14 =22 =64-5 =19 =4 =59,819-3,9,6,56,88,32+78,56-(23+8) 5 (287) (14+35)7 =56-31 = 5 4 =49 7 =25 =20 =7 (24-18) 9 88-(46-18) 36 (3 3) =69 =88-28 =369 =54 =60 =4,18+279 (18+27) 9 =18+3 =45 9 =21 =5 48-3 4(8-3) =32 -3
3、 = 45 =29 =20,(42+14)-35 79-28 62-(15-3) 50-366 =56-35 =63-28 =62-12 =50-6 =21 =35 =50 =44,(6+6) 3 (54-22)8 36(164) =123 =328 =364 =4 =4 =9 14(83-76) =147 =2,31,=13,36,=13,63,=42,32,=13,50,=13,41,=41,73-26+35 72 (33) 63 (44-37) =47+35 =729 =63 7 =82 =8 =9 (82-18)8 54-(62-34) 18+57 =648 =54-28 =18+35 =8 =26 =53,32,25+48 =25+32 =57(元）,35-3=32（元） 328=4（个）,答：剩下32元钱。剩下的钱买8元一个，可以买4个。,12+364=21,（12+8）5=4,
