(1)
3÷2+5÷2=
(3+5)÷2=

4.8÷6+7.2÷6=
(4.8+7.2)÷6=

3.6÷0.3+8.4÷0.3=
(3.6+8.4)÷0.3=

我發(fā)現(xiàn)的規(guī)律用字母表示是:a÷c+b÷c=
(a+b)÷c
(a+b)÷c

(2)
12.5÷2×0.8=
12.5×0.8÷2=

25÷8×40
25×40÷8

7÷2.8×0.4=
7×0.4÷2.8=

我發(fā)現(xiàn)的規(guī)律用字母表示是:a÷b×c=
a×c÷b
a×c÷b
分析:根據(jù)給出的題目,然后進(jìn)行解答,進(jìn)而找出規(guī)律,得出結(jié)論;據(jù)此解答.
解答:解:(1)
3÷2+5÷2=4
(3+5)÷2=4
;
4.8÷6+7.2÷6=2
(4.8+7.2)÷6=2
;
3.6÷0.3+8.4÷0.3=40
(3.6+8.4)÷0.3=40

因?yàn)槿M題,每組題的得數(shù)相同,所以發(fā)現(xiàn)的規(guī)律用字母表示是:a÷c+b÷c=(a+b)÷c;

(2)
12.5÷2×0.8=5
12.5×0.8÷2=5
;
25÷8×40=125
25×40÷8=125
;
7÷2.8×0.4=1
7×0.4÷2.8=1

因?yàn)槿M題,每組題的得數(shù)相同,發(fā)現(xiàn)的規(guī)律用字母表示是:a÷b×c=a×c÷b;
故答案為:(a+b)÷c,a×c÷b.
點(diǎn)評(píng):結(jié)合題意,進(jìn)行分析找出規(guī)律,是解答此題的關(guān)鍵.
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