20.5-2.52-7.48简便运算
用简便方法计算下面各题.7.6+0.49+3.4+10.5132×125×2537×9999×123+12320.5-2.52-7.4856×101...
用简便方法计算下面各题. 7.6+0.49+3.4+10.51 32×125×25 37×99 99×123+123 20.5-2.52-7.48 56×101
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①7.6+0.49+3.4+10.51
=(7.6+3.4)+(0.49+10.51)
=11+11
=22
②32×125×25
=(8×4)×125×25
=(8×125)×(4×25)
=1000×100
=100000
③37×99
=37×(100-1)
=37×100-37
=3700-37
=3663
④99×123+123
=(99+1)×123
=100×123
=12300
⑤20.5-2.52-7.48
=20.5-(2.52+7.48)
=20.5-10
=10.5
⑥56×101
=56×(100+1)
=56×100+56×1
=5600+56
=5656
=(7.6+3.4)+(0.49+10.51)
=11+11
=22
②32×125×25
=(8×4)×125×25
=(8×125)×(4×25)
=1000×100
=100000
③37×99
=37×(100-1)
=37×100-37
=3700-37
=3663
④99×123+123
=(99+1)×123
=100×123
=12300
⑤20.5-2.52-7.48
=20.5-(2.52+7.48)
=20.5-10
=10.5
⑥56×101
=56×(100+1)
=56×100+56×1
=5600+56
=5656
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