神马作文网黄冈小状元数学5年级上第七页培优作业
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黄冈小状元数学5年级上第七页培优作业
用简便方法计算下面各题.
（1）2.9x0.45+0.29x4.2+0.029x13
(2)3.84x9.6+0.96x61.6
要简便运算详细写出过程
用简便方法计算下面各题.
（1）2.9x0.45+0.29x4.2+0.029x13
(2)3.84x9.6+0.96x61.6
要简便运算详细写出过程
（1）2.9x0.45+0.29x4.2+0.029x13
=2.9x0.45+2.9x0.42+2.9x0.13
=2.9x(0.45+0.42+0.13)
=2.9x1
=2.9
（2）3.84x9.6+0.96x61.6
=3.84x9.6+9.6x6.16
=(3.84+6.16)x9.6
=10x9.6
=96
=2.9x0.45+2.9x0.42+2.9x0.13
=2.9x(0.45+0.42+0.13)
=2.9x1
=2.9
（2）3.84x9.6+0.96x61.6
=3.84x9.6+9.6x6.16
=(3.84+6.16)x9.6
=10x9.6
=96