2.7×7.6×2.4-0.2×7.6简便方法?
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2.7×7.6一7.6X2.4一0.2×7.6
=7.6×(2.7-2.4-0.2)
=7.6×0.1=0.76
=7.6×(2.7-2.4-0.2)
=7.6×0.1=0.76
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7.6*(2.7+2.4-0.2)
=7.6*4.9
=7.6*5-7.6*0.1
=38-0.76
=37.24
=7.6*4.9
=7.6*5-7.6*0.1
=38-0.76
=37.24
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原式=7.6x(2.7x2.4-0.2)
=7.6x[2.7x(2+0.4)-0.2]
=7.6x(2.7x2+2.7x0.4-0.2)
=7.6x(5.4+0.54x2-0.2)
=7.6x(5.4+1.08-0.2)
=7.6x(5.2+1.08)
=7.6x6.28
=6.28x(7+0.6)
=6.28x7+6.28x0.6
=7x(6+0.2+0.08)+6.28x0.6
=7x6+7x0.2+7x0.08+6.28x0.6
=42+1.4+0.56+6.28x0.6
=42+1.96+6.28x0.6
=43.96+0.6x(6+0.2+0.08)
=43.96+3.6+0.12+0.048
=43.96+3.72+0.048
=43.96+3.768
=44-0.04+3.768
=44+3.728
=47.728
=7.6x[2.7x(2+0.4)-0.2]
=7.6x(2.7x2+2.7x0.4-0.2)
=7.6x(5.4+0.54x2-0.2)
=7.6x(5.4+1.08-0.2)
=7.6x(5.2+1.08)
=7.6x6.28
=6.28x(7+0.6)
=6.28x7+6.28x0.6
=7x(6+0.2+0.08)+6.28x0.6
=7x6+7x0.2+7x0.08+6.28x0.6
=42+1.4+0.56+6.28x0.6
=42+1.96+6.28x0.6
=43.96+0.6x(6+0.2+0.08)
=43.96+3.6+0.12+0.048
=43.96+3.72+0.048
=43.96+3.768
=44-0.04+3.768
=44+3.728
=47.728
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