69×102+6.9×10.9+0.69×0.19×190×190简便运算?
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69×102+6.9×10.9+0.69×0.19×190×190
=69x(102+1.09+0.19x19x19)
=69x(103.09+68.59)
=69x171.68
=11845.92
=69x(102+1.09+0.19x19x19)
=69x(103.09+68.59)
=69x171.68
=11845.92
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69x102+6.9x10.9+0.69x0.19x190x190
=6.9(10.2+10.9+1.9x19x19)
=6.9(19+2.1+1.9x19x19)
=6.9[19(1+1.9x19)+2.1]
=6.9{19[1+1.9(10+9)]+2.1}
=6.9[19(1+19+17.1)+2.1]
=6.9[(10+9)37.1+2.1]
=6.9(371+333.9+2.1)
=6.9(700+7)
=4830+48.3
=4878.3
=6.9(10.2+10.9+1.9x19x19)
=6.9(19+2.1+1.9x19x19)
=6.9[19(1+1.9x19)+2.1]
=6.9{19[1+1.9(10+9)]+2.1}
=6.9[19(1+19+17.1)+2.1]
=6.9[(10+9)37.1+2.1]
=6.9(371+333.9+2.1)
=6.9(700+7)
=4830+48.3
=4878.3
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