Question

口算． 46+34=	72-28=	800×5=	298×9≈
32×2=	96÷3=	80÷4=	106×4≈
64÷2=	27+45=	85-78=	89÷3≈
2 5 + 1 5 =	4 7 - 1 7 =	3 8 + 4 8 =	9 10 - 6 10 =

Answer 1

分析：運(yùn)用整數(shù)的加減、乘除及分?jǐn)?shù)的加減法的計(jì)算法則進(jìn)行計(jì)算即可．

解答：解：

46+34=80	72-28=44	800×5=4000	298×9≈2700
32×2=64	96÷3=32	80÷4=20	106×4≈400
64÷2=32	27+45=72	85-78=7	89÷3≈30
2 5 + 1 5 = 3 5	4 7 - 1 7 = 3 7	3 8 + 4 8 = 7 8	9 10 - 6 10 = 3 10

點(diǎn)評(píng)：本題考查了整數(shù)乘除加減及分?jǐn)?shù)的加減法的計(jì)算法則．