
脱式计算,能简便的简便. 4.2-1.38+5.8-3.62 0.125×0.25×32 711×41419+5519÷147+711 3
脱式计算,能简便的简便.4.2-1.38+5.8-3.620.125×0.25×32711×41419+5519÷147+7113.5×114+1.25×2710+3.8...
脱式计算,能简便的简便. 4.2-1.38+5.8-3.62 0.125×0.25×32 711×41419+5519÷147+711 3.5×114+1.25×2710+3.8÷45.
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(1)4.2-1.38+5.8-3.62
=4.2+5.8-(1.38+3.62),
=10-5,
=5;
(2)0.125×0.25×32,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(3)
×4
+5
÷1
+
,
=
×4
+5
×
+
×1,
=
×(4
+5
+1),
=
×11,
=7;
(4)3.5×1
+1.25×2
+3.8÷
=3.5×1.25+1.25×2.7+3.8÷0.8,
=(3.5+2.7)×1.25+4.75,
=6.2×1.25+4.75,
=7.75+4.75,
=12.5.
=4.2+5.8-(1.38+3.62),
=10-5,
=5;
(2)0.125×0.25×32,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(3)
7 |
11 |
14 |
19 |
5 |
19 |
4 |
7 |
7 |
11 |
=
7 |
11 |
14 |
19 |
5 |
19 |
7 |
11 |
7 |
11 |
=
7 |
11 |
14 |
19 |
5 |
19 |
=
7 |
11 |
=7;
(4)3.5×1
1 |
4 |
7 |
10 |
4 |
5 |
=3.5×1.25+1.25×2.7+3.8÷0.8,
=(3.5+2.7)×1.25+4.75,
=6.2×1.25+4.75,
=7.75+4.75,
=12.5.
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