3.8×0.45+0.38×4.2×13 谁回答我就采纳谁和点赞谁
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3.8×0.45+0.38×4.2×13
=3.8×0.45+3.8×0.42×13
=3.8×(0.45+0.42×13)
=3.8×(5×0.09+6×0.07×13)
=3.8×(5×0.09+6×0.91)
=3.8×(5×0.09+5×0.91+0.91)
=3.8×(5×(0.09+0.91)+0.91)
=3.8×(5+0.91)
=3.8×5.91
=22.458
=3.8×0.45+3.8×0.42×13
=3.8×(0.45+0.42×13)
=3.8×(5×0.09+6×0.07×13)
=3.8×(5×0.09+6×0.91)
=3.8×(5×0.09+5×0.91+0.91)
=3.8×(5×(0.09+0.91)+0.91)
=3.8×(5+0.91)
=3.8×5.91
=22.458
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