二年级数学下册练习十一ppt课件

加、减、乘、除四种运算称为四加、减、乘、除四种运算称为四则运算。则运算。（一级运算）（一级运算）加减混合运算：从左往右依次运加减混合运算：从左往右依次运算；算；乘除混合运算：从左往右依次运乘除混合运算：从左往右依次运算；算；同级混合运算：从左往右依次运同级混合运算：从左往右依次运算；算；（二级运算）（二级运算）加、减、乘、除四种运算称为四则运算。（一级运算）加减混合运算1不同级混合运算的规律：不同级混合运算的规律：先算乘除法，再算加减法（先算乘除法，再算加减法（先先乘除，后加减乘除，后加减）同级运算：同级运算：从左往右从左往右依次运依次运 算；算；有括号先算括号里面的。有括号先算括号里面的。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232+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 32+14-8 25-12+45 33815212322293537357915253545822315434-17+3=17+3=201833=63=1834-17+31833556+13 45-47 19-486=30+13 =45-28 =19-8=43 =17 =11459+14 842 64-408=5+14 =22 =64-5=19 =4 =59 56+13 45-47 6819-396568832+78819-396568832+78756-(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 =456-(23+8)5(287)818+279 (18+27)9 =18+3 =45 9=21 =5 48-3 4(8-3)=32-3 =45=29 =2018+279 (18+27)9(42+14)-35 79-28 62-(15-3)50-366=56-35 =63-28 =62-12 =50-6=21 =35 =50 =44 (42+14)-35 79-28 62-(110(6+6)3 (54-22)8 36(164)=123 =328 =364=4 =4 =914(83-76)=147=2(6+6)3 (54-22)8 36(11131=1336=1363=4232=1350=1341=4131=1336=1363=4232=1350=1341=411273-26+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 73-26+35 72(33)133225+48=25+32=57(元）3225+481435-3=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。35-3=32（元）答：剩下32元钱。剩下的钱买8元一个，可1512+364=21（12+8）5=412+364=21（12+8）5=416