问题
解答题
计算: (1)20
(2)
(3)[(88+
(4)[2
|
答案
(1)20
-2.73-8.27+15 23
,7 13
=(20
+15 23
)-(2.73+8.27),7 13
=21
-11,226 299
=10
;226 299
(2)
×75 9
+5 12
×11 9
×5,7 12
=
×75 9
+5 12
×15 9
,7 12
=(7
+15 12
)×7 12
,5 9
=9×
,5 9
=5;
(3)[(88+
)×1.125-54]÷23%,8 9
=[(88+
)×18 9
-54]÷23%,1 8
=[(88×
+9 8
×8 9
)-54]÷23%,9 8
=[99+1-54]÷0.23,
=46÷0.23,
=200;
(4)[2
÷(34 9
-2 5
)×111 15
]÷4.02,1 11
=[
÷222 9
×12 3
]÷4.02,1 11
=[
×22 9
×3 8
]÷4.02,12 11
=1÷4.02,
=100÷402,
=
.50 201