
简便计算. 25+235+5.75+6.4 &...
简便计算.25+235+5.75+6.425×101712×13+1112×759×314+37×59....
简便计算. 25+235+5.75+6.4 25×101 712×13+1112×7 59×314+37×59.
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(1)25+2
+5.75+6.4,
=(25+5.75)+(2.6+6.4),
=30.75+9,
=39.75;
(2)25×101,
=25×100+25×1,
=2500+25,
=2525;
(3)
×13+
×7,
=
×13+
×11,
=
×(13+11),
=
×24,
=14;
(4)
×
+
×
.
=
×(
+
),
=
×
,
=
.
3 |
5 |
=(25+5.75)+(2.6+6.4),
=30.75+9,
=39.75;
(2)25×101,
=25×100+25×1,
=2500+25,
=2525;
(3)
7 |
12 |
11 |
12 |
=
7 |
12 |
7 |
12 |
=
7 |
12 |
=
7 |
12 |
=14;
(4)
5 |
9 |
3 |
14 |
3 |
7 |
5 |
9 |
=
5 |
9 |
3 |
14 |
3 |
7 |
=
5 |
9 |
9 |
14 |
=
5 |
14 |
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