问题
解答题
计算,能简算的要简算. ①23-
②(3618÷18-145)×20 ③4.6×
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答案
①23-
-12 17
,5 17
=23-(
+12 17
),5 17
=23-1,
=22;
②(3618÷18-145)×20,
=(201-145)×20,
=56×20,
=1120;
③4.6×
+8.4÷11 8
-8 11
×5,11 8
=4.6×
+8.4×11 8
-11 8
×5,11 8
=(4.6+8.4-5)×
,11 8
=8×
,11 8
=11.