2.1×45+2.3有什么简便计算?
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2.1*45+2.3
=(2*45)+0.1*45+2.3
=90+4.5+2.3
=90+6.8
=96.8
=(2*45)+0.1*45+2.3
=90+4.5+2.3
=90+6.8
=96.8
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2.1*4.5+2.3
=(2+0.1)*4.5+2.3
=2*4.5+0.1*4.5+2.3
=9+0.45+2.3
=9.45+2.3
=11.75
计算中运用了乘法分配律使计算简便
=(2+0.1)*4.5+2.3
=2*4.5+0.1*4.5+2.3
=9+0.45+2.3
=9.45+2.3
=11.75
计算中运用了乘法分配律使计算简便
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2.1*45+2.3
=2.1*(40+5)+2.3
=84+10.5+2.3
=96.8
=2.1*(40+5)+2.3
=84+10.5+2.3
=96.8
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