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答案：$81 - 44 = 37$
$75 + 17 = 92$
$90 - 29 = 61$
$29 + 19 = 48$
$38 + 62 = 100$
$64 - 19 = 45$
$18 + 73 = 91$
$90 - 48 = 42$
$63 - 19 = 44$
$72 - 14 = 58$
$41 - 25 = 16$
$13 + 29 = 42$
$100 - 48 = 52$
$19 + 57 = 76$
$57 + 34 = 91$
$53 - 19 = 34$
$80 - 58 = 22$
$49 + 28 = 77$
$48 + 32 = 80$

答案：$39 + 56 = 95$
$28 + 39 = 67$
$18 + 14 = 32$
$43 + 27 = 70$
$85 - 58 = 27$
$80 - 19 = 61$
$16 + 15 = 31$
$34 + 36 = 70$
$71 - 39 = 32$
$61 - 17 = 44$
$85 - 16 = 69$
$93 - 26 = 67$
$28 + 19 = 47$
$90 - 37 = 53$
$59 + 24 = 83$
$73 - 34 = 39$
$64 + 25 = 89$
$55 - 26 = 29$
$86 - 37 = 49$

答案：1.
$\begin{array}{r} 32\\ +15\\ \hline 47\\ +25\\ \hline72 \end{array}$
$32 + 15 + 25 = 72$
2.
$\begin{array}{r} 23\\ +27\\ \hline 50\\ +19\\ \hline69 \end{array}$
$23 + 27 + 19 = 69$
3.
$\begin{array}{r} 12\\ +43\\ \hline 55\\ +28\\ \hline83 \end{array}$
$12 + 43 + 28 = 83$
4.
$\begin{array}{r} 51\\ +27\\ \hline 78\\ +19\\ \hline97 \end{array}$
$51 + 27 + 19 = 97$