简便计算(需过程):4.2×3.5×1.3
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简便计算(需过程):4.2×3.5×1.3简便计算(需过程):4.2×3.5×1.3简便计算(需过程):4.2×3.5×1.3=4.2*0.5*7*1.3=2.1*9.1=2.1*(9+0.1)=18
简便计算(需过程):4.2×3.5×1.3
简便计算(需过程):4.2×3.5×1.3
简便计算(需过程):4.2×3.5×1.3
=4.2*0.5*7*1.3=2.1*9.1=2.1*(9+0.1)=18.9+0.21=19.11
=2.1*2*3.5*1.3
=2.1*7*1.3
=2.1*9.4
=2.1*10-2.1*0.6
=21-1.26
=19.74
4.2*3.5*1.3
=7*0.6*0.7*5*1.3
=4.9*3.9
=(5-0.1)*(4-0.1)
=20-0.4-0.5+0.01
=20-0.9+0.01
=19.11