8.63乘以4.6加上5.4乘以5.21加上34.2乘以0.54的简便方法?
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8.63×4.6+5.4×5.21+34.2×0.54
=8.63×4.6+(5.4×5.21+3.42×5.4)
=8.63×4.6+5.4×(5.21+3.42)
=8.63×4.6+5.4×8.63
=(4.6+5.4)×8.63
=10×8.63
=86.3
=8.63×4.6+(5.4×5.21+3.42×5.4)
=8.63×4.6+5.4×(5.21+3.42)
=8.63×4.6+5.4×8.63
=(4.6+5.4)×8.63
=10×8.63
=86.3
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