问题
解答题
用递等式计算. ①
②7.2÷[(3.01-2.86)×0.24] ③346×25÷17÷
④1.25×63×32÷9. |
答案
①
÷3 4
-5 6
×7 12
,4 35
=
-9 10
,1 15
=
;5 6
②7.2÷[(3.01-2.86)×0.24],
=7.2÷[0.15×0.24],
=7.2÷0.036,
=200;
③346×25÷17÷
,1 34
=346×25×
×34,1 17
=(346×25)×(
×34)1 17
=8650×2,
=17300;
④1.25×63×32÷9,
=(1.25×32)×(63÷9),
=(1.25×8×4)×7,
=(10×4)×7,
=40×7,
=280.