黄冈小状元数学5年级上第七页培优作业

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（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 =10x...