题目内容
计算
(1)
×8×
×1.25
(2)1
×1.25+1
×2.2-1
(3)
÷〔(
+
)×
〕
(4)7.8÷[32×(1-
)+3.6].
(1)
| 13 |
| 5 |
| 8 |
| 13 |
(2)1
| 4 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
(3)
| 3 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
(4)7.8÷[32×(1-
| 5 |
| 8 |
(1)
×8×
×1.25,
=(
×
)×(8×1.25),
=
×10,
=16;
(2)1
×1.25+1
×2.2-1
,
=1.8×1.25+1.25×2.2-1.25×1,
=(1.8+2.2-1)×1.25,
=3×1.25,
=3.75;
(3)
÷[(
+
)×
],
=
÷[
×
],
=
×
,
=
;
(4)7.8÷[32×(1-
)+3.6],
=7.8÷[32×
+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
| 13 |
| 5 |
| 8 |
| 13 |
=(
| 13 |
| 5 |
| 8 |
| 13 |
=
| 8 |
| 5 |
=16;
(2)1
| 4 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
=1.8×1.25+1.25×2.2-1.25×1,
=(1.8+2.2-1)×1.25,
=3×1.25,
=3.75;
(3)
| 3 |
| 8 |
| 1 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 9 |
| 20 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 160 |
| 27 |
=
| 20 |
| 9 |
(4)7.8÷[32×(1-
| 5 |
| 8 |
=7.8÷[32×
| 3 |
| 8 |
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
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