计算下面各题,怎样简便就怎样算.(1)(316÷38+34)×(18?0.125)(2)39×148149+148×86149+48×74149
计算下面各题,怎样简便就怎样算.(1)(316÷38+34)×(18?0.125)(2)39×148149+148×86149+48×74149(3)35+(3.25?2...
计算下面各题,怎样简便就怎样算.(1)(316÷38+34)×(18?0.125)(2)39×148149+148×86149+48×74149(3)35+(3.25?214)×[117?0.24÷(5?4.79)](4)52×3?73×4+94×5?115×6+136×7?157×8.
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(1)(
÷
+
)×(
-0.125),
=(
÷
+
)×(0.125-0.125),
=(
÷
+
)×0,
=0;
(2)39×
+148×
+48×
,
=39×
+86×
+24×
,
=(39+86+24)×
,
=149×
,
=148;
(3)
+(3.25-2
)×[1
-0.24÷(5-4.79)],
=
+(3.25-2.25)×[1
-0.24÷0.21],
=
+1×[1
-1
],
=
+1×0,
=
;
(4)
-
3 |
16 |
3 |
8 |
3 |
4 |
1 |
8 |
=(
3 |
16 |
3 |
8 |
3 |
4 |
=(
3 |
16 |
3 |
8 |
3 |
4 |
=0;
(2)39×
148 |
149 |
86 |
149 |
74 |
149 |
=39×
148 |
149 |
148 |
149 |
148 |
149 |
=(39+86+24)×
148 |
149 |
=149×
148 |
149 |
=148;
(3)
3 |
5 |
1 |
4 |
1 |
7 |
=
3 |
5 |
1 |
7 |
=
3 |
5 |
1 |
7 |
1 |
7 |
=
3 |
5 |
=
3 |
5 |
(4)
5 |
2×3 |
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