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计算下面各题,能简便计算的要简便计算.(56+38)×24 ...
计算下面各题,能简便计算的要简便计算.(56+38)×2487×878867÷1.25÷0.823÷(1-23)×562325-29+225-594.2×102-8.4...
计算下面各题,能简便计算的要简便计算.(56+38)×24 87×8788 67÷1.25÷0.8 23÷(1-23)×56 2325-29+225-59 4.2×102-8.4
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①(
+
)×24
=24×
+
×24
=20+9
=29
②87×
=(88-1)×
=88×
-1×
=87-
=86
③67÷1.25÷0.8
=67÷(1.25×0.8)
=67÷1
=67
④
÷(1-
)×
=
×3×
=2×
=1
⑤
-
+
-
=(
+
)-(
+
)
=1-
=
⑥4.2×102-8.4
=4.2×102-4.2×2
=4.2×(102-2)
=4.2×100
=420
5 |
6 |
3 |
8 |
=24×
5 |
6 |
3 |
8 |
=20+9
=29
②87×
87 |
88 |
=(88-1)×
87 |
88 |
=88×
87 |
88 |
87 |
88 |
=87-
87 |
88 |
=86
1 |
88 |
③67÷1.25÷0.8
=67÷(1.25×0.8)
=67÷1
=67
④
2 |
3 |
2 |
3 |
5 |
6 |
=
2 |
3 |
5 |
6 |
=2×
5 |
6 |
=1
2 |
3 |
⑤
23 |
25 |
2 |
9 |
2 |
25 |
5 |
9 |
=(
23 |
25 |
2 |
25 |
5 |
9 |
2 |
9 |
=1-
7 |
9 |
=
2 |
9 |
⑥4.2×102-8.4
=4.2×102-4.2×2
=4.2×(102-2)
=4.2×100
=420
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