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第47页

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6×(22÷4)-1.4=31.6

(9÷3+1)×6=24

(6-3)×(9-1)=24

$\frac {1}{4}$ ÷ $\frac {7}{6}$ ÷ $\frac {5}{2}$ ÷ $\frac {3}{8}$ × $\frac {7}{5}$=$\frac {8}{25}$

3.5

$=\frac {9}{10}÷\frac {1}{4}$

$=\frac {18}{5}$

$=\frac {5}{9}+\frac {2}{3}$

$=\frac {11}{9}$

$=\frac {5}{19}×(\frac {4}{11}+\frac {7}{11})$

$=\frac {5}{19}×1$

$=\frac {5}{19}$

$=1+\frac {48}{49}+\frac {1}{49}$

$=1+1$

$=2$

=2.5×0.4×7.2

=1×7.2

=7.2

=(375+25)-(47+153)

=400-200

=200

$=(43-1)×\frac {42}{43}$

$=42-\frac {42}{43}$

$=41\frac 1{43}$

=18+16

=34

(6+36)÷3-2×4-1=5

(6+36÷3-2)×4-1=63

6+36÷[(3-2)×(4-1)]=18