
怎样算简便就怎样算.(1)12.74-18+2.26-9.875(2)4.8
怎样算简便就怎样算.(1)12.74-18+2.26-9.875(2)4.8×3.9+6.1×445(3)(2.5-3.2×516)÷(4815÷3.4)(4)18÷[5...
怎样算简便就怎样算.(1)12.74-18+2.26-9.875(2)4.8×3.9+6.1×445(3)(2.5-3.2×516)÷(4815÷3.4)(4)18÷[56+(58-13)].
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(1)12.74-
+2.26-9.875,
=12.74-0.125+2.26-9.875,
=(12.74+2.26)-(0.125+9.875),
=15-10,
=5;
(2)4.8×3.9+6.1×4
,
=4.8×3.9+6.1×4.8,
=4.8×(3.9+6.1),
=4.8×10,
=48;
(3)(2.5-3.2×
)÷(4
÷3.4),
=(2.5-1)÷(
×
),
=1.5÷
,
=
×
,
=
;
(4)18÷[
+(
-
)],
=18÷[
+
-
],
=18÷[
-
+
],
=18÷[
+
],
=18÷
,
=16.
1 |
8 |
=12.74-0.125+2.26-9.875,
=(12.74+2.26)-(0.125+9.875),
=15-10,
=5;
(2)4.8×3.9+6.1×4
4 |
5 |
=4.8×3.9+6.1×4.8,
=4.8×(3.9+6.1),
=4.8×10,
=48;
(3)(2.5-3.2×
5 |
16 |
8 |
15 |
=(2.5-1)÷(
68 |
15 |
5 |
17 |
=1.5÷
4 |
3 |
=
3 |
2 |
3 |
4 |
=
9 |
8 |
(4)18÷[
5 |
6 |
5 |
8 |
1 |
3 |
=18÷[
5 |
6 |
5 |
8 |
1 |
3 |
=18÷[
5 |
6 |
1 |
3 |
5 |
8 |
=18÷[
1 |
2 |
5 |
8 |
=18÷
9 |
8 |
=16.
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