脱式计算 (1)(6
(2)
(3)2.25×
(4)(1+3+5+…+1001)-(2+4+6+…+1000) |
(1)(6
-31 2
)÷(13+111 4
),1 5
=(6
-31 2
)÷241 4
,1 5
=3
÷1 4
,121 5
=
×13 4
,5 121
=
;65 484
(2)
+1 6
+1 12
+1 30
+1 42
,1 56
=
-1 2
+1 3
-1 3
+1 4
-1 4
+1 5
-1 5
+1 6
-1 6
+1 7
-1 7
,1 8
=
-1 2
,1 8
=
;3 8
(3)2.25×
+2.75÷13 5
+60%,2 3
=2.25×
+2.75×3 5
+1×3 5
,3 5
=(2.25+2.75+1)×
,3 5
=6×
,3 5
=3
;3 5
(4)(1+3+5+…+1001)-(2+4+6+…+1000),
=1+(3-2)+(5-4)+…+(1001-1000),
=1+1+1+…+1,
=501.