1
8
×
8
8
=
1
13
÷
1
13
1
13
=
13
21
13
21
+
8
21
=
29
4
-
25
4
25
4
=1.
分析:此連續(xù)等式最后結(jié)果等于1,則等號(hào)兩邊的值都等于1,分別看看八分之一乘幾、十三分之一除以幾、四分之二十九減去幾等于1,適當(dāng)填入數(shù)字讓計(jì)算結(jié)果為1即可.
解答:解:①1÷
1
8
=8;
1
13
÷1=
1
13
;
③1-
8
21
=
13
21

29
4
-1=
25
4

故答案為:8,
1
13
,
13
21
25
4
點(diǎn)評(píng):做此類(lèi)題首先找到固定的值,然后經(jīng)計(jì)算讓等號(hào)兩邊的結(jié)果都等于這個(gè)固定值即可.
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