问题
解答题
你认为怎样算简便就怎样算. ①(
②[19.8-(4.9+9.8)]×(1÷0.01) ③155×360×77÷90÷11÷31 ④1÷28×72-27×
|
答案
①(
+1 6
)÷(1 5
-7 8
),5 12
=
÷11 30
,11 24
=
×11 30
,24 11
=
;4 5
②[19.8-(4.9+9.8)]×(1÷0.01),
=[19.8-14.7]×100,
=5.1×100,
=510;
③155×360×77÷90÷11÷31,
=(155÷31)×(360÷90)×(77÷11),
=5×4×7,
=140;
④1÷28×72-27×
-17÷28,1 28
=
×72-27×1 28
-17×1 28
,1 28
=
×(72-27-17),1 28
=
×28,1 28
=1.