题目内容
用递等式计算,能简算的要简算.
(1)46×8-120÷15
(2)
+2
+
+3
(3)(12.5×8-40)÷0.6
(4)
+(
-
)×
(5)3.4×2.77+0.23×3.4
(6)(
+
+
)×72.
(1)46×8-120÷15
(2)
| 3 |
| 4 |
| 9 |
| 17 |
| 1 |
| 4 |
| 8 |
| 17 |
(3)(12.5×8-40)÷0.6
(4)
| 2 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 5 |
| 3 |
(5)3.4×2.77+0.23×3.4
(6)(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
(1)46×8-120÷15,
=368-8,
=360;
(2)
+2
+
+3
,
=(
+
)+(2
+3
),
=1+6,
=7;
(3)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;
(4)
+(
-
)×
,
=
+
×
,
=
+
,
=
;
(5)3.4×2.77+0.23×3.4
=(2.77+0.23)×3.4,
=3×3.4,
=10.2;
(6)(
+
+
)×72
=
×72+
×72+
×72,
=30+8+27,
=65.
=368-8,
=360;
(2)
| 3 |
| 4 |
| 9 |
| 17 |
| 1 |
| 4 |
| 8 |
| 17 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
=1+6,
=7;
(3)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;
(4)
| 2 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 15 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 9 |
=
| 8 |
| 9 |
(5)3.4×2.77+0.23×3.4
=(2.77+0.23)×3.4,
=3×3.4,
=10.2;
(6)(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=30+8+27,
=65.
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