5×2.9×3.8的简便计算?
2022-09-13
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5×2.9×3.8
=5×(4-0.2)×2.9
=(5×4-5×0.2)×2.9
=(20-1)×(3-0.1)
=20×3-1×3-20×0.1+1×0.1
=60-3-2+0.1
=55.1
=5×(4-0.2)×2.9
=(5×4-5×0.2)×2.9
=(20-1)×(3-0.1)
=20×3-1×3-20×0.1+1×0.1
=60-3-2+0.1
=55.1
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5X2.9x3.8
=5x(3一0.l)x3.8
=(5x3一5x0.l)x3.8
=(l5一0.5)x(4一0.2)
=15x4一15x0.2一0.5x4十0.5x0.2
=60一3一2十0.l
=55.1
=5x(3一0.l)x3.8
=(5x3一5x0.l)x3.8
=(l5一0.5)x(4一0.2)
=15x4一15x0.2一0.5x4十0.5x0.2
=60一3一2十0.l
=55.1
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(2.9+3.8)=6.7乘以5等于33.5
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