0.65*6.4-6.5*0.54+6.5*0.99用简便运算怎么算急

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0.65*6.4-6.5*0.54+6.5*0.99用简便运算怎么算急0.65*6.4-6.5*0.54+6.5*0.99用简便运算怎么算急0.65*6.4-6.5*0.54+6.5*0.99用简便运

0.65*6.4-6.5*0.54+6.5*0.99用简便运算怎么算急
0.65*6.4-6.5*0.54+6.5*0.99用简便运算怎么算

0.65*6.4-6.5*0.54+6.5*0.99用简便运算怎么算急
原式=6.5×0.64-6.5×0.54+6.5×0.99
=6.5×(0.64-0.54+0.99)
=6.5×1.09
=7.085

0.65*6.4-6.5*0.54+6.5*0.99
=6.5*0.64-6.5*0.54+6.5*0.99
=6.5*(0.64-0.54+0.99)
=6.5*(0.10+0.99)
=6.5*1.09
=6.5*1+6.5*0.09
=6.5+0.585
=7.085