题目内容
在横线上填上“<”、“>”或“=”.
(1)56÷7÷2 = = 56÷(7×2) |
(2)48×(5+6) > > 48×5+6 |
(3)840÷21 = = 840÷3÷7 |
(4)24+102+0 > > (24+102)×0 |
(5)50-20+15 > > 50-(20+15) |
(6)18-15÷3 > > (18-15)÷3. |
分析:分别计算出左右两边的运算结果,再比较即可.
解答:解:(1)56÷7÷2,
=8÷2,
=4;
56÷(7×2),
=56÷14,
=4;
4=4;
所以:56÷7÷2=56÷(7×2);
(2)48×(5+6),
=48×30,
=1440;
48×5+6,
=240+6,
=246;
1440>246;
所以:48×(5+6)>48×5+6;
(3)840÷21=40;
840÷3÷7,
=280÷7,
=40;
40=40;
所以:840÷21=840÷3÷7;
(4)24+102+0,
=126+0,
=126;
(24+102)×0=0;
126>0;
所以:24+102+0>(24+102)×0;
(5)50-20+15,
=30+15,
=45;
50-(20+15),
=50-35,
=15;
45>15;
所以:50-20+15>50-(20+15).
(6)18-15÷3,
=18-5,
=3;
(18-15)÷3,
=3÷3,
=1;
3>1;
所以:18-15÷3>(18-15)÷3.
故答案为:=,>,=,>,>,>.
=8÷2,
=4;
56÷(7×2),
=56÷14,
=4;
4=4;
所以:56÷7÷2=56÷(7×2);
(2)48×(5+6),
=48×30,
=1440;
48×5+6,
=240+6,
=246;
1440>246;
所以:48×(5+6)>48×5+6;
(3)840÷21=40;
840÷3÷7,
=280÷7,
=40;
40=40;
所以:840÷21=840÷3÷7;
(4)24+102+0,
=126+0,
=126;
(24+102)×0=0;
126>0;
所以:24+102+0>(24+102)×0;
(5)50-20+15,
=30+15,
=45;
50-(20+15),
=50-35,
=15;
45>15;
所以:50-20+15>50-(20+15).
(6)18-15÷3,
=18-5,
=3;
(18-15)÷3,
=3÷3,
=1;
3>1;
所以:18-15÷3>(18-15)÷3.
故答案为:=,>,=,>,>,>.
点评:解决本题关键是理清正确的计算顺序,或者能熟练的运用运用定律.
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