7.7×12.1-2.1×7.3简便运算?
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7.7×12.1-2.1×7.3
=7.7×(10+2.1)-2.1×7.3
=7.7×10+7.7×2.1-2.1×7.3
=77+2.1×(7.7-7.3)
=77+2.1×0.4
=77+0.84
=77.84
=7.7×(10+2.1)-2.1×7.3
=7.7×10+7.7×2.1-2.1×7.3
=77+2.1×(7.7-7.3)
=77+2.1×0.4
=77+0.84
=77.84
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