问题
解答题
脱式计算. ①231-152÷49 ②
③5+0.45÷0.9-1.75 ④1110÷(56×(
|
答案
①231-152÷49
=231-3
.5 49
=227
;44 49
②
÷[(1 3
+2 3
)×1 5
]1 13
=
÷[1 3
×13 15
],1 13
=
×15,1 3
=5;
③5+0.45÷0.9-1.75
=5+0.5-1.75,
=3.75;
④1110÷[56×(
-3 7
)]3 8
=1110÷[56×
-56×3 7
],3 8
=1110÷[24-21],
=1110÷3,
=370.