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8439+1001和7.08x1.5+7.5x7.08和84x102-84x2和0.234x101-23.4全部都用简便计算.
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8439+1001和7.08x1.5+7.5x7.08 和84x102-84x2和0.234x101-23.4 全部都用简便计算.
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答案和解析
8439+1001
=8439+1000+1
=9439+1
=9440
7.08x1.5+7.5x7.08
=7.08×(1.5+7.5)
=7.08×9
=63.72
84x102-84x2
=84×(100-2)
=84×100
=8400
0.234x101-23.4
=0.234×101-0.234×100
=0.234×(101-100)
=0.234×1
=0.234
=8439+1000+1
=9439+1
=9440
7.08x1.5+7.5x7.08
=7.08×(1.5+7.5)
=7.08×9
=63.72
84x102-84x2
=84×(100-2)
=84×100
=8400
0.234x101-23.4
=0.234×101-0.234×100
=0.234×(101-100)
=0.234×1
=0.234
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