0.49×4.9×0.8简便运算用乘法分配律?
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0.49×4.9×0.8
=0.49×(5×0.8-0.1×0.8)
=0.49×(4-0.08)
=0.5×3.92-0.01×3.92
=1.96-0.0392
=1.9208
=0.49×(5×0.8-0.1×0.8)
=0.49×(4-0.08)
=0.5×3.92-0.01×3.92
=1.96-0.0392
=1.9208
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展开全部
0.49×4.9×0.8
=0.49×0.8×4.9
=(0.5*0.8-0.008)*4.9
=0.392*(5-0.1)
=1.96-0.0392
=1.9208
=0.49×0.8×4.9
=(0.5*0.8-0.008)*4.9
=0.392*(5-0.1)
=1.96-0.0392
=1.9208
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