
用简便方法计算.3.5×9.9 &n...
1个回答
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(1)3.5×9.9,
=3.5×(10-0.1),
=3.5×10-3.5×0.1,
=35-0.35,
=34.65;
(2)4.62+9.9,
=4.62+10-0.1,
=14.52;
(3)
×0.6+0.6÷4.
=
×0.6+0.6×
,
=(
+
)×0.6,
=1×0.6,
=0.6.
=3.5×(10-0.1),
=3.5×10-3.5×0.1,
=35-0.35,
=34.65;
(2)4.62+9.9,
=4.62+10-0.1,
=14.52;
(3)
3 |
4 |
=
3 |
4 |
1 |
4 |
=(
3 |
4 |
1 |
4 |
=1×0.6,
=0.6.
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