Question

5×80=	180×6=	7.73+2.07=	12-0.9=	500÷5=
42×5=	8.97+1.03=	120-25×4=	1 4 + 1 8 =	2 3 - 1 3 =
1 5 + 1 10 =	2 3 + 1 4 =	3 4 - 1 2 =	1 6 - 1 7 =

Answer 1

分析：本題根據(jù)小數(shù)、分?jǐn)?shù)、整數(shù)的乘法、除法、加法、減法的運(yùn)算法則計(jì)算即可．我們運(yùn)用整數(shù)乘、除法的計(jì)算法則進(jìn)行計(jì)算，整數(shù)、小數(shù)的加減，及分?jǐn)?shù)加減法的計(jì)算法則進(jìn)行計(jì)算即可，異分母的分?jǐn)?shù)的加、減法，注意分?jǐn)?shù)的通分．

解答：解：

5×80=400	180×6=1080	7.73+2.07=9.8	12-0.9=11.1	500÷5=100
42×5=210	8.97+1.03=10	120-25×4=20	1 4 + 1 8 = 3 8	2 3 - 1 3 = 1 3
1 5 + 1 10 = 3 10	2 3 + 1 4 = 11 12	3 4 - 1 2 = 1 4	1 6 - 1 7 = 1 42

點(diǎn)評(píng)：完成有關(guān)于小數(shù)的計(jì)算時(shí)，要注意小數(shù)點(diǎn)的對(duì)齊及小數(shù)點(diǎn)位置的變化，完成有關(guān)于分?jǐn)?shù)的計(jì)算時(shí)，要注意通分約分．