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.
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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