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0.75÷[(0.3十2.2)x5]脱式计算

=0.75÷[2.5X5] =0.75÷12.5 =0.06

0.25÷[(1/3 +0.4)x5/22] =1/4÷【(1/3+2/5)x5/22】 =1/4÷(11/5x5/22) =1/4÷1/2 =1/2

=(48+17)X5 =65X5 =325

6÷[(2/5+9/10)x5/13] =6÷【13/10×5/13] =6÷1/2 =12

解:6÷[(2/5+9/10)x5/13] =6÷[(2+9/2)/13] =6÷[(13/2)/13] =6÷(1/2) =12

240÷4+62x5脱式计算 240÷4+62x5 =60+310 =370

120一60÷5x5 =120-60 =60

=210÷70 =3

(3.2+0.12)x5 =3.2x5+0.12x5 =16+0.6 =16.6

=42÷42x5/7x5/7 =1x5/7x5/7 =25/49

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