1.2✖️9.9➕1.2简便计算?
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1.2✖️9.9➕1.2
=1.2✖️(9.9➕1)
=1.2*10.9
=10.9+10.9*0.2
=10.9+2.18
=13.08
=1.2✖️(9.9➕1)
=1.2*10.9
=10.9+10.9*0.2
=10.9+2.18
=13.08
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1.2×9.9+1.2
=1.2×(10-0.1)+1.2
=1.2×10-1.2×0.1+1.2
=12+1.2-0.12
=13.2-0.12
=13.08
=1.2×(10-0.1)+1.2
=1.2×10-1.2×0.1+1.2
=12+1.2-0.12
=13.2-0.12
=13.08
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1.2×9.9+1.2
=1.2×(10-0.1)+1.2
=1.2×10-1.2×0.1+1.2 乘法分配律
=12-0.12+1.2
=12+(1.2-0.12)
=12+1.08
=13.08
=1.2×(10-0.1)+1.2
=1.2×10-1.2×0.1+1.2 乘法分配律
=12-0.12+1.2
=12+(1.2-0.12)
=12+1.08
=13.08
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