用简便 方法计算 (1) 2.9X0.45+0.29X4.2+0.029X13 (2) 3.48X9.6+0.96X61.6
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(1) 2.9X0.45+0.29X4.2+0.029X13
= 2.9X0.45+2.9X0.42+2.9X0.13
=2.9×(0.45+0.42+0.13)
=2.9
(2) 3.48X9.6+0.96X61.6
= 3.48X9.6+9.6X6.16
=9.6×(3.48+6.16)
=92.544
= 2.9X0.45+2.9X0.42+2.9X0.13
=2.9×(0.45+0.42+0.13)
=2.9
(2) 3.48X9.6+0.96X61.6
= 3.48X9.6+9.6X6.16
=9.6×(3.48+6.16)
=92.544
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