3.9*9.8*0.93简便运算4.2*1.2-5.2*0.7
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3.9*9.8*0.93简便运算4.2*1.2-5.2*0.73.9*9.8*0.93简便运算4.2*1.2-5.2*0.73.9*9.8*0.93简便运算4.2*1.2-5.2*0.73.9*9.8
3.9*9.8*0.93简便运算4.2*1.2-5.2*0.7
3.9*9.8*0.93简便运算
4.2*1.2-5.2*0.7
3.9*9.8*0.93简便运算4.2*1.2-5.2*0.7
3.9*9.8*0.93
=(4-0.1)*(10-0.2)*(1-0.07)
=(40-1-0.8+0.02)*(1-0.07)
=(39-0.78)*(1-0.07)
=39-0.78-39*0.07+0.78*0.07
=39-0.78-2.73+0.0546
=39-3.51+0.0546
=39-3.51+0.01+0.0446
=35.5446
4.2*1.2-5.2*0.7
=4.8+0.24-3.5-0.14
=1.4