8.3X6.7+0.8X68+83X7.2简便运算?
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8.3X6.7+0.8Ⅹ68+83X7.2=8.3X6.7+(1-0.2)X68+8.3X10X7.2=8.3X(6.7+10x7.2)+68-0.2X68=8.3X78.7+68-13.6=653.21+68-13.6=707.61
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8.3×6.7+0.8×68+83×7.2
=8.3×7-8.3×0.3+1×68-0.2×68+83×7+83×0.2
=8.3×(7+2)-2.49+68-13.6+80×7+3×7
=8.3×9-(2.49+13.6)+68+21+560
=74.7-16.09+89+560
=58.61+649
=707.61
=8.3×7-8.3×0.3+1×68-0.2×68+83×7+83×0.2
=8.3×(7+2)-2.49+68-13.6+80×7+3×7
=8.3×9-(2.49+13.6)+68+21+560
=74.7-16.09+89+560
=58.61+649
=707.61
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