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2016-08-03 · 知道合伙人教育行家
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四年级简便运算题下册
5.7×99+5.7
= 5.7×(99+1)
=5.7×100
=570
34×9.9
=34×(10-0.1)
=34×10-34×0.1
=340-3.4
=336.6
57×101
=57×(100+1)
=57×100+57×1
=5757
7.8×1.1
=7.8×(1+0.1)
=7.8×1+7.8×0.1
=7.8+0.78
=8.58
5.7×99+5.7
= 5.7×(99+1)
=5.7×100
=570
34×9.9
=34×(10-0.1)
=34×10-34×0.1
=340-3.4
=336.6
57×101
=57×(100+1)
=57×100+57×1
=5757
7.8×1.1
=7.8×(1+0.1)
=7.8×1+7.8×0.1
=7.8+0.78
=8.58
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