题目内容
脱式计算.
4.67-(2.98+0.67)
73.8×16-73.8×6
(
+
)÷
,+
×75+
×75.
4.67-(2.98+0.67)
73.8×16-73.8×6
(
4 |
5 |
1 |
4 |
7 |
3 |
1 |
10 |
1 |
4 |
3 |
4 |
分析:(1)根据减法的性质进行简算;
(2)根据乘法分配律进行简算;
(3)先算小括号里面的加法,再算除法,最后算括号外面的加法;
(4)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)先算小括号里面的加法,再算除法,最后算括号外面的加法;
(4)根据乘法分配律进行简算.
解答:解:
(1)4.67-(2.98+0.67),
=4.67-2.98-0.67,
=4.67-0.67-2.98,
=4-2.98,
=1.02;
(2)73.8×16-73.8×6,
=73.8×(16-6),
=73.8×10,
=738;
(3)(
+
)÷
+
,
=
÷
+
,
=
+
,
=
;
(4)
×75+
×75,
=(
+
)×75,
=1×75,
=75.
(1)4.67-(2.98+0.67),
=4.67-2.98-0.67,
=4.67-0.67-2.98,
=4-2.98,
=1.02;
(2)73.8×16-73.8×6,
=73.8×(16-6),
=73.8×10,
=738;
(3)(
4 |
5 |
1 |
4 |
7 |
3 |
1 |
10 |
=
21 |
20 |
7 |
3 |
1 |
10 |
=
9 |
20 |
1 |
10 |
=
11 |
20 |
(4)
1 |
4 |
3 |
4 |
=(
1 |
4 |
3 |
4 |
=1×75,
=75.
点评:考查了运算定律与简便运算,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律简便计算.
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