题目内容
递等式计算
(1)144+55×7
(2)2000+45×124
(3)(854+938)÷14
(4)
+
-
(5)1-
-
(6)
-
+
.
(1)144+55×7
(2)2000+45×124
(3)(854+938)÷14
(4)
| 5 |
| 18 |
| 5 |
| 18 |
| 7 |
| 18 |
(5)1-
| 7 |
| 9 |
| 2 |
| 9 |
(6)
| 20 |
| 15 |
| 10 |
| 20 |
| 15 |
| 20 |
分析:(1)先算乘法,再算加法;
(2)先算乘法,再算加法;
(3)先算小括号里面的加法,再算括号外的除法;
(4)分母不变分子相加减即可;
(5)根据减法的性质简算;
(6)运用加法结合律简算.
(2)先算乘法,再算加法;
(3)先算小括号里面的加法,再算括号外的除法;
(4)分母不变分子相加减即可;
(5)根据减法的性质简算;
(6)运用加法结合律简算.
解答:解:(1)144+55×7,
=144+385,
=529;
(2)2000+45×124,
=2000+5580,
=7580;
(3)(854+938)÷14,
=1792÷14,
=128;
(4)
+
-
,
=
,
=
;
(5)1-
-
,
=1-(
+
),
=1-1,
=0;
(6)
-
+
,
=
+(
-
),
=
+
,
=
+
,
=
.
=144+385,
=529;
(2)2000+45×124,
=2000+5580,
=7580;
(3)(854+938)÷14,
=1792÷14,
=128;
(4)
| 5 |
| 18 |
| 5 |
| 18 |
| 7 |
| 18 |
=
| 5+5-7 |
| 18 |
=
| 3 |
| 18 |
(5)1-
| 7 |
| 9 |
| 2 |
| 9 |
=1-(
| 7 |
| 9 |
| 2 |
| 9 |
=1-1,
=0;
(6)
| 20 |
| 15 |
| 10 |
| 20 |
| 15 |
| 20 |
=
| 20 |
| 15 |
| 15 |
| 20 |
| 10 |
| 20 |
=
| 20 |
| 15 |
| 5 |
| 20 |
=
| 4 |
| 3 |
| 1 |
| 4 |
=
| 19 |
| 12 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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