题目内容
(2012?仙游县模拟)递等式计算(能简算的要简算)
(8.5-4)×(0.32÷1.6)
90.7×99+90.7
÷[
×(
+
)]
÷(
+
×
)
(8.5-4)×(0.32÷1.6)
90.7×99+90.7
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
| 13 |
| 18 |
| 5 |
| 6 |
| 2 |
| 3 |
| 3 |
| 8 |
分析:(1)先算括号内的,再算乘法;
(2)运用乘法分配律的逆运算简算;
(3)先算小括号内的,再算中括号内的,最后算括号外的;
(4)先算括号内的乘法,再算括号内的加法,最后算括号外的除法.
(2)运用乘法分配律的逆运算简算;
(3)先算小括号内的,再算中括号内的,最后算括号外的;
(4)先算括号内的乘法,再算括号内的加法,最后算括号外的除法.
解答:解:(1)(8.5-4)×(0.32÷1.6),
=4.5×0.2,
=0.9;
(2)90.7×99+90.7,
=90.7×(99+1),
=90.7×100,
=9070;
(3)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(4)
÷(
+
×
),
=
÷(
+
),
=
÷
,
=
×
,
=
.
=4.5×0.2,
=0.9;
(2)90.7×99+90.7,
=90.7×(99+1),
=90.7×100,
=9070;
(3)
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 1 |
| 2 |
| 6 |
| 5 |
=
| 9 |
| 20 |
| 3 |
| 5 |
=
| 9 |
| 20 |
| 5 |
| 3 |
=
| 3 |
| 4 |
(4)
| 13 |
| 18 |
| 5 |
| 6 |
| 2 |
| 3 |
| 3 |
| 8 |
=
| 13 |
| 18 |
| 5 |
| 6 |
| 1 |
| 4 |
=
| 13 |
| 18 |
| 13 |
| 12 |
=
| 13 |
| 18 |
| 12 |
| 13 |
=
| 2 |
| 3 |
点评: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简便计算.
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