题目内容
(1)360+240÷15×28
(2)6÷2.4-0.3×1.4
(3)
×6+6×
(4)(
-0.4)÷
×
.
(2)6÷2.4-0.3×1.4
(3)
3 |
7 |
4 |
7 |
(4)(
2 |
3 |
2 |
3 |
3 |
4 |
分析:(1)(2)(4)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(3)可根据乘法分配律计算.
(3)可根据乘法分配律计算.
解答:解:(1)360+240÷15×28
=360+16×28,
=360+448,
=808;
(2)6÷2.4-0.3×1.4
=2.5-0.42,
=2.08;
(3)
×6+6×
=(
+
)×6,
=1×6,
=6;
(4)(
-0.4)÷
×
=(
-
)×
×
,
=
×
×
,
=
.
=360+16×28,
=360+448,
=808;
(2)6÷2.4-0.3×1.4
=2.5-0.42,
=2.08;
(3)
3 |
7 |
4 |
7 |
=(
3 |
7 |
4 |
7 |
=1×6,
=6;
(4)(
2 |
3 |
2 |
3 |
3 |
4 |
=(
2 |
3 |
2 |
5 |
3 |
2 |
3 |
4 |
=
4 |
15 |
3 |
2 |
3 |
4 |
=
3 |
10 |
点评:在完成有关于分数的计算时要注意通分约分,完成有关于小数的计算时要注意小数点位置的变化.
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(1)360+240÷15×28 | (2)6÷2.4-0.3×1.4 | (3)×6+6× | (4)(-0.4)÷×. |