(1.25+0.5+2.6)×6.4怎样用简便方法计算?
3个回答
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(1.25+0.5+2.6)*6.4
=(1.25+0.5+2.5+0.1)*8*0.8
=(10+4+20+0.8)*0.8
=34.8*0.8
=34.8*(1-0.2)
=34.8-6.96
=35-7-0.2+0.04
=28-0.16
=27.84
=(1.25+0.5+2.5+0.1)*8*0.8
=(10+4+20+0.8)*0.8
=34.8*0.8
=34.8*(1-0.2)
=34.8-6.96
=35-7-0.2+0.04
=28-0.16
=27.84
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展开全部
(1.25+0.5+2.6)×6.4
=3.9×6.4
=6.4×3+6.4×0.3+6.4×0.3+6. 4×0.3
=19.2+1.92+1.92+1.92
=24.96
=3.9×6.4
=6.4×3+6.4×0.3+6.4×0.3+6. 4×0.3
=19.2+1.92+1.92+1.92
=24.96
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1.25+0.5+2.6=4.35
再用4.35×6.4=27.84
所以最后结果27.84
再用4.35×6.4=27.84
所以最后结果27.84
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