0.56×6.8简算怎么算3.16×6.5？
1个回答
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0.56×6.8
=（0.5+0.06）（7-0.2）
=0.5×7-0.5×0.2+0.06×7-0.06×0.2
=3.5-0.1+0.42-0.012
=3.4+0.42-0.012
=3.82-0.012
=3.808
3.16×6.5
=（3+0.16）（6+0.5）
=3×6+3×0.5+0.16×6+0.16×0.5
=18+1.5+0.96+0.08
=19.5+0.96+0.08
=19.5+0.96+0.04+0.04
=19.5+1+0.04
=20.5+0.04
=20.54
=（0.5+0.06）（7-0.2）
=0.5×7-0.5×0.2+0.06×7-0.06×0.2
=3.5-0.1+0.42-0.012
=3.4+0.42-0.012
=3.82-0.012
=3.808
3.16×6.5
=（3+0.16）（6+0.5）
=3×6+3×0.5+0.16×6+0.16×0.5
=18+1.5+0.96+0.08
=19.5+0.96+0.08
=19.5+0.96+0.04+0.04
=19.5+1+0.04
=20.5+0.04
=20.54
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