题目内容
用递等式计算(能简算的要用简便方法计算).
4.32+3.2+5.68
79×101-79
132+25×8
20-
×5
(0.125×8-0.5)×4
(0.25+
)÷(
-
)
4.32+3.2+5.68
79×101-79
132+25×8
20-
| 3 |
| 25 |
(0.125×8-0.5)×4
(0.25+
| 5 |
| 8 |
| 7 |
| 4 |
| 7 |
| 8 |
(1)4.32+3.2+5.68
=4.32+5.68+3.2,
=10+3.2,
=13.2;
(2)79×101-79
=(101-1)×79,
=100×79,
=7900;
(3)132+25×8
=132+200,
=332;
(4)20-
×5
=20-
,
=19
;
(5)(0.125×8-0.5)×4
=(1-0.5)×4,
=0.5×4,
=2;
(6)(0.25+
)÷(
-
)
=(
+
)÷(
-
),
=
÷
,
=1.
=4.32+5.68+3.2,
=10+3.2,
=13.2;
(2)79×101-79
=(101-1)×79,
=100×79,
=7900;
(3)132+25×8
=132+200,
=332;
(4)20-
| 3 |
| 25 |
=20-
| 3 |
| 5 |
=19
| 2 |
| 5 |
(5)(0.125×8-0.5)×4
=(1-0.5)×4,
=0.5×4,
=2;
(6)(0.25+
| 5 |
| 8 |
| 7 |
| 4 |
| 7 |
| 8 |
=(
| 2 |
| 8 |
| 5 |
| 8 |
| 14 |
| 8 |
| 7 |
| 8 |
=
| 7 |
| 8 |
| 7 |
| 8 |
=1.
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