
计算下列各题,能简算的要简算. 12+7.5×36÷7.2 [34...
计算下列各题,能简算的要简算.12+7.5×36÷7.2[34?(58?14)]÷3879÷115+511×292.5×32×12.54.83-1.56+0.17-2.4...
计算下列各题,能简算的要简算. 12+7.5×36÷7.2 [34?(58?14)]÷38 79÷115+511×29 2.5×32×12.5 4.83-1.56+0.17-2.44 24×(13+14-16)
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(1)12+7.5×36÷7.2
=12+270÷7.2
=12+37.5
=49.5;
(2)[
?(
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)]÷
=[
-
+
]÷
=[
+
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]÷
=[1-
]÷
=
÷
=1;
(3)
÷
+
×
=
×
+
×
=(
+
)×
=1×
=
;
(4)2.5×32×12.5
=2.5×(4×8)×12.5
=(2.5×4)×(8×12.5)
=10×100
=1000;
(5)4.83-1.56+0.17-2.44
=(4.83+0.17)-(1.56+2.44)
=5-4
=1;
(6)24×(
+
=12+270÷7.2
=12+37.5
=49.5;
(2)[
3 |
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8 |
1 |
4 |
3 |
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=[
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4 |
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=[
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=[1-
5 |
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=
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=1;
(3)
7 |
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11 |
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2 |
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=
7 |
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=1×
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=
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(4)2.5×32×12.5
=2.5×(4×8)×12.5
=(2.5×4)×(8×12.5)
=10×100
=1000;
(5)4.83-1.56+0.17-2.44
=(4.83+0.17)-(1.56+2.44)
=5-4
=1;
(6)24×(
1 |
3 |