题目内容

怎样算简便就怎样算.
7.8×101
5
9
×〔
3
4
-(
7
16
-
1
4
)〕
25×1.25×32
(3.75+4.1+2.35)×9.8
3
4
×0.53+75%×1.47.
①7.8×101,
=7.8×(100+1),
=7.8×100+7.8×1,
=780+7.8,
=787.8;

5
9
×[
3
4
-(
7
16
-
1
4
],
=
5
9
×[
3
4
-
7
16
+
1
4
],
=
5
9
×
9
16

=
5
16


③25×1.25×32
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;

④(3.75+4.1+2.35)×9.8,
=(3.75+2.35+4.1)×9.8,
=10.2×9.8,
=(10+0.2)×9.8,
=10×9.8+0.2×9.8,
=98+1.96,
=99.96;

3
4
×0.53+75%×1.47,
=0.75×0.53+0.75×1.47,
=0.75×(0.53+1.47),
=0.75×2,
=1.5
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