
脱式计算.(能简算的要简算)(1)12.75-517+114-1217(2)[1-(15+0.3)]
脱式计算.(能简算的要简算)(1)12.75-517+114-1217(2)[1-(15+0.3)]÷18(3)29×40%+79÷52(4)1.25×3.2×2.5....
脱式计算.(能简算的要简算)(1)12.75-517+114-1217(2)[1-(15+0.3)]÷18(3)29×40%+79÷52(4)1.25×3.2×2.5.
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(1)12.75-
+1
-
,
=(12.75+1
)-(
+
),
=14-1,
=13;
(2)[1-(
+0.3)]÷
,
=[1-0.5]÷
,
=0.5÷
,
=4;
(3)
×40%+
÷
,
=(
+
)×40%,
=1×40%,
=0.4;
(4)1.25×3.2×2.5,
=(1.25×8)×(0.4×2.5),
=10×1,
=10.
5 |
17 |
1 |
4 |
12 |
17 |
=(12.75+1
1 |
4 |
5 |
17 |
12 |
17 |
=14-1,
=13;
(2)[1-(
1 |
5 |
1 |
8 |
=[1-0.5]÷
1 |
8 |
=0.5÷
1 |
8 |
=4;
(3)
2 |
9 |
7 |
9 |
5 |
2 |
=(
2 |
9 |
7 |
9 |
=1×40%,
=0.4;
(4)1.25×3.2×2.5,
=(1.25×8)×(0.4×2.5),
=10×1,
=10.
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