问题
解答题
脱式计算,怎样简便就怎样算.
|
答案
(1)23×
+14×14 39 16 39
=
×(23+16)14 39
=
×3914 39
=14;
(2)14
-6.46-3.543 17
=14
-(6.46+3.54)3 17
=14
-103 17
=4
;3 17
(3)
+1 13
×(12 13
-5 2
)1 3
=
+1 13
×12 13
-5 2
×12 13 1 3
=
+1 13
-30 13 4 13
=
;27 13
(4)
×3 13
+3 4
÷10 13 4 3
=
×3 13
+3 4
×10 13 3 4
=
×(3 4
+3 13
)10 13
=
;3 4
(5)3×(
+2 15
)-1 12 1 4
=3×
+3×2 15
-1 12 1 4
=
+6 15
-1 4 1 4
=
;2 5
(6)(1
-12 3
)÷(6-2 5
)×42 7 2 7
=1
÷54 15
×45 7 2 7
=
×19 15
×7 40 30 7
=
.19 20