①0.77×11□0.7×10

②2.95×10□30

③43.28×23□432.8×2.3

④10.01×12□120
⑤14.96×12□180 ⑥15.9×19□320 ⑦81×28□82×29 ⑧48×77□49×78.
分析:①兩個(gè)因數(shù)都大,則積一定大;
②左邊計(jì)算式的積是29.5,顯然小于右邊;
③兩個(gè)因數(shù)一個(gè)擴(kuò)大10倍,而另一個(gè)縮小10倍,結(jié)果不變;
④左邊的積是120.12,顯然大于120;
⑤左邊的積是179.52,顯然小于180;
⑥左邊的積是302.1,顯然小于320;
⑦⑧左邊的兩個(gè)因數(shù)相對(duì)右邊的兩個(gè)因數(shù)都較小,則積一定較小,即可得解.
解答:解:①因?yàn)?.77>0.7,11>10,
所以0.77×11>0.7×10;
②2.95×10=29.5<30,
③因?yàn)?32.8=43.28×10,2.3=23÷10,
所以43.28×23=432.8×2.3;
④10.01×12=120.12>120;
⑤14.96×12=179.52<180;
⑥15.9×19=302.1<320;
⑦81×28<82×29;
⑧48×77<49×78.
故答案為:>,<,=,>,<,<,<,<.
點(diǎn)評(píng):此題首先進(jìn)行計(jì)算,然后比較數(shù)的大。
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