题目内容
计算下列各题:
(1)3450-450÷25×18=
(2)4
×1
÷6
=
(3)18÷2.5+1
×6.5=
(4)(
+
-
)÷6+4
=
(5)
×
-(0.2+
-
)÷
=
(6)
+
+
+
+
=
(1)3450-450÷25×18=
(2)4
| 2 |
| 3 |
| 1 |
| 8 |
| 3 |
| 10 |
(3)18÷2.5+1
| 3 |
| 5 |
(4)(
| 2 |
| 7 |
| 3 |
| 5 |
| 5 |
| 42 |
| 1 |
| 3 |
(5)
| 7 |
| 8 |
| 10 |
| 3 |
| 1 |
| 6 |
| 1 |
| 7 |
| 10 |
| 21 |
(6)
| 2×2 |
| 1×3 |
| 4×4 |
| 3×5 |
| 6×6 |
| 5×7 |
| 8×8 |
| 7×9 |
| 10×10 |
| 9×11 |
分析:(1)先算除法,再算乘法,最后算减法,
(2)按照从左到右的顺序计算;
(3)先算乘除法,再算加法;
(4)先算括号里,再算括号外的;
(5)先算括号里,再算乘除法,最后算减法;
(6)把算式化成1+
+1+
+1+
+1+
+1+
,在进行计算.
(2)按照从左到右的顺序计算;
(3)先算乘除法,再算加法;
(4)先算括号里,再算括号外的;
(5)先算括号里,再算乘除法,最后算减法;
(6)把算式化成1+
| 1 |
| 3 |
| 1 |
| 15 |
| 1 |
| 35 |
| 1 |
| 63 |
| 1 |
| 99 |
解答:解:(1)3450-450÷25×18,
=3450-18×18,
=3450-324,
=3126;
(2)4
×1
÷6
,
=
÷6
,
=
;
(3)18÷2.5+1
×6.5,
=7.2+10.4,
=17.6;
(4)(
+
-
)÷6+4
,
=(
-
)÷6+4
,
=
÷6+4
,
=
+4
,
=
;
(5)
×
-(0.2+
-
)÷
=
-(
-
)×
,
=
-
×
,
=
-
,
=
;
(6)
+
+
+
+
,
=1+
+1+
+1+
+1+
+1+
,
=5+(
+
+
+
+
),
=5+
×(1-
+
-
+
-
+
-
+
-
),
=5+
×(1-
),
=5+
×
,
=5+
,
=5
;
=3450-18×18,
=3450-324,
=3126;
(2)4
| 2 |
| 3 |
| 1 |
| 8 |
| 3 |
| 10 |
=
| 21 |
| 4 |
| 3 |
| 10 |
=
| 5 |
| 6 |
(3)18÷2.5+1
| 3 |
| 5 |
=7.2+10.4,
=17.6;
(4)(
| 2 |
| 7 |
| 3 |
| 5 |
| 5 |
| 42 |
| 1 |
| 3 |
=(
| 31 |
| 35 |
| 5 |
| 42 |
| 1 |
| 3 |
=
| 161 |
| 210 |
| 1 |
| 3 |
=
| 161 |
| 1260 |
| 1 |
| 3 |
=
| 5621 |
| 1260 |
(5)
| 7 |
| 8 |
| 10 |
| 3 |
| 1 |
| 6 |
| 1 |
| 7 |
| 10 |
| 21 |
=
| 35 |
| 12 |
| 11 |
| 30 |
| 1 |
| 7 |
| 21 |
| 10 |
=
| 35 |
| 12 |
| 47 |
| 210 |
| 21 |
| 10 |
=
| 35 |
| 12 |
| 47 |
| 100 |
=
| 367 |
| 150 |
(6)
| 2×2 |
| 1×3 |
| 4×4 |
| 3×5 |
| 6×6 |
| 5×7 |
| 8×8 |
| 7×9 |
| 10×10 |
| 9×11 |
=1+
| 1 |
| 3 |
| 1 |
| 15 |
| 1 |
| 35 |
| 1 |
| 63 |
| 1 |
| 99 |
=5+(
| 1 |
| 3 |
| 1 |
| 15 |
| 1 |
| 35 |
| 1 |
| 63 |
| 1 |
| 99 |
=5+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 11 |
=5+
| 1 |
| 2 |
| 1 |
| 11 |
=5+
| 1 |
| 2 |
| 10 |
| 11 |
=5+
| 5 |
| 11 |
=5
| 5 |
| 11 |
点评:考查了整数、小数、分数的四则混合运算顺序及灵活运用运算定律进行简算.
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