4.7x0.5x2.6怎样简便计算?
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解:4.7x0.5x2.6
=4.7X1.3
=4.7X(1十0.3)
=4.7十1.41
=6.11
=4.7X1.3
=4.7X(1十0.3)
=4.7十1.41
=6.11
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4.7*0.5*2.6
=(4+0.7)*[0.5*(2+0.6)]
=4*1.3+0.7*1.3
=5. 2+0.91
=6.11
=(4+0.7)*[0.5*(2+0.6)]
=4*1.3+0.7*1.3
=5. 2+0.91
=6.11
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原式=4.7×1.3
=(5-0.3)×(1+0.3)
=5×1+5×0.3-0.3×1-0.3×0.3
=5+1.5-0.3-0.09
=5+1.20-0.09
=5+1.11
=6.11
=(5-0.3)×(1+0.3)
=5×1+5×0.3-0.3×1-0.3×0.3
=5+1.5-0.3-0.09
=5+1.20-0.09
=5+1.11
=6.11
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简便计算方法是运用乘法结合律,先算0.5×2.6
4.7×0.5×2.6
=4.7×(0.5×2.6)
=4.7×1.3
=6.11
4.7×0.5×2.6
=4.7×(0.5×2.6)
=4.7×1.3
=6.11
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4.7x0.5x2.6
=0.5x2.6ⅹ4.7
=1.3ⅹ4.7
=(1+0.3)ⅹ4.7
=4.7+1.41
=6.11
=0.5x2.6ⅹ4.7
=1.3ⅹ4.7
=(1+0.3)ⅹ4.7
=4.7+1.41
=6.11
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