神机妙算细又巧(能简算的要写出简算过程)①0.65×14+87×65%?1320②(23?12+16)÷124③76×(123
神机妙算细又巧(能简算的要写出简算过程)①0.65×14+87×65%?1320②(23?12+16)÷124③76×(123?153)+23×(153+176)?53×...
神机妙算细又巧(能简算的要写出简算过程)①0.65×14+87×65%?1320②(23?12+16)÷124③76×(123?153)+23×(153+176)?53×(123?176).
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①0.65×14+87×65%?
=0.65×14+87×0.65-0.65,
=0.65×(14+87-1),
=0.65×100,
=65;
②(
?
+
)÷
=(
-
+
)×24,
=
×24-
×24+
×24,
=16-12+4,
=8;
③76×(
?
)+23×(
+
)?53×(
?
).
=76×
-76×
+23×
+23×
-53×
+53×
,
=
-
+
+
-
+
,
=(
?
)+(
+
)-(
-
),
=1+1-1,
=1.
13 |
20 |
=0.65×14+87×0.65-0.65,
=0.65×(14+87-1),
=0.65×100,
=65;
②(
2 |
3 |
1 |
2 |
1 |
6 |
1 |
24 |
=(
2 |
3 |
1 |
2 |
1 |
6 |
=
2 |
3 |
1 |
2 |
1 |
6 |
=16-12+4,
=8;
③76×(
1 |
23 |
1 |
53 |
1 |
53 |
1 |
76 |
1 |
23 |
1 |
76 |
=76×
1 |
23 |
1 |
53 |
1 |
53 |
1 |
76 |
1 |
23 |
1 |
76 |
=
76 |
23 |
76 |
53 |
23 |
53 |
23 |
76 |
53 |
23 |
53 |
76 |
=(
76 |
23 |
53 |
23 |
23 |
76 |
53 |
76 |
76 |
53 |
23 |
53 |
=1+1-1,
=1.
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