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0.75÷[(0.3十2.2)x5]脱式计算

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

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

=540÷(10+80) =540÷90 =6

=210÷70 =3

10+16x5=10=80=90 540除90=6 注意原则:有括号先算括号,乘加相遇时先算乘法再算加法。

=42÷42x5/7x5/7 =1x5/7x5/7 =25/49

=540÷9x5 =60x5 =300

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

[(X-5)x5+5]÷5=5 解:[(X-5)×5+5]=5×5 (X-5)×5+5=25 (X-5)×5=25-5 (X-5)×5=20 X-5=20÷5 X-5=4 X=5+4 X=9

63/3=21 (79+21)x5 =100x5 =500

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