2.2×46+2.2×59-0.2×50的简便方法?
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原式=2.2x(46+59)-2×5
=2.2x(100+5)-2x5
=2.2x100+2.2x5-2x5
=220+(2.2-2)x5
=220+0.2x5
=220+1
=221
=2.2x(100+5)-2x5
=2.2x100+2.2x5-2x5
=220+(2.2-2)x5
=220+0.2x5
=220+1
=221
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