3.7*6.2 4.8*5.2请问用简便方法怎么计算
3个回答
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3.7*6.2
=(3.5+0.2)*(6+0.2)
=3.5*6+3.5*0.2+0.2*6+0.2*0.2
=21+0.7+1.2+0.04
=22.94
4.8*5.2
=(5-0.2)*(5+0.2)
=5*5-0.2*0.2
=24.96
=(3.5+0.2)*(6+0.2)
=3.5*6+3.5*0.2+0.2*6+0.2*0.2
=21+0.7+1.2+0.04
=22.94
4.8*5.2
=(5-0.2)*(5+0.2)
=5*5-0.2*0.2
=24.96
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展开全部
3.7*6.2
=3.7*(6+0.2)
=3.7*6+3.7*0.2
=(3+0.7)*6+0.74
=18+4.2+0.74
=22.2+0.74
=29.6
4.8*5.2
=4.8*(5+0.2)
=24+0.96
=24.96
=3.7*(6+0.2)
=3.7*6+3.7*0.2
=(3+0.7)*6+0.74
=18+4.2+0.74
=22.2+0.74
=29.6
4.8*5.2
=4.8*(5+0.2)
=24+0.96
=24.96
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3.7*6.2合不成方便的数,不如拆了算3.7*(6+0.2)=
(5-0.2)*(5+0.2)=24.6
(5-0.2)*(5+0.2)=24.6
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