2.49✘2.8 0.24✘6.2的简便运算
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2.49✘2.8
=(2.5-0.01)(3-0.2)
=7.5-0.03-0.5+0.002
=7.5-0.53+0.002
=6.97+0.002
=6.972
0.24✘6.2
=0.24x(6+0.2)
=1.44+0.048
=1.488
=(2.5-0.01)(3-0.2)
=7.5-0.03-0.5+0.002
=7.5-0.53+0.002
=6.97+0.002
=6.972
0.24✘6.2
=0.24x(6+0.2)
=1.44+0.048
=1.488
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2.49X2.8+0.24X6.2
=2.5X4X0.7-0.01X2.8+0.24X6+0.24X0.02
=10X0.7-0.028+1.44+0.048
=7+1.44+(0.048-0.028)
=8.44+0.02
=8.46
=2.5X4X0.7-0.01X2.8+0.24X6+0.24X0.02
=10X0.7-0.028+1.44+0.048
=7+1.44+(0.048-0.028)
=8.44+0.02
=8.46
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(1)2.49✘2.8
=(2.5-0.01)x28
=2.5x28-0.01x28
=70-0.28
=69.72;
(2)0.24✘6.2
=0.24x(6+0.2)
=0.24x6+0.24x0.2
=1.44+0.048
=1.488。
=(2.5-0.01)x28
=2.5x28-0.01x28
=70-0.28
=69.72;
(2)0.24✘6.2
=0.24x(6+0.2)
=0.24x6+0.24x0.2
=1.44+0.048
=1.488。
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2.49×2.8
=(2.5-0.01)×2.8
=2.5×4×0.7-0.028
=6.972
0.24×6.2
=(0.25-0.01)×(6+0.2)
=0.25×6+0.25×0.2-0.06-0.002
=1.5+0.05-0.06-0.002
=1.49-0.002
=1.488
=(2.5-0.01)×2.8
=2.5×4×0.7-0.028
=6.972
0.24×6.2
=(0.25-0.01)×(6+0.2)
=0.25×6+0.25×0.2-0.06-0.002
=1.5+0.05-0.06-0.002
=1.49-0.002
=1.488
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解答:2.49×2.8
=2.49×(3-0.2)
=2.49×3-2.49×0.2
=7.47-0.498
=6.976
0.24×6.2
=0.24×(6+0.2)
=0.24×6+0.24×0.2
=1.44+0.048
=1.488
=2.49×(3-0.2)
=2.49×3-2.49×0.2
=7.47-0.498
=6.976
0.24×6.2
=0.24×(6+0.2)
=0.24×6+0.24×0.2
=1.44+0.048
=1.488
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