Statements, and, or, not and if…then
Decide which sentences are statements, use and, or and not correctly, test a promise "if … then …" and find the contrapositive.
- فلسطين: الصف ١١
- إيران: الصف ١١
- أفغانستان: الصف ١٠
- أوكرانيا: الصف ٧
- روسيا: الصف ٧
- ألمانيا: الصف ٥
- فرنسا: الصف ١١
لم يُترجَم هذا المختبر إلى هذه اللغة بعد.
الدليل
A statement is a sentence that is either true or false. "7 is even" is a statement (a false one); "x + 2 = 5" and "Close the door" are not.
"p and q" is true only when both parts are true. "p or q" is true when at least one part is true. "not p" turns true into false.
"If p then q" is false only when p is true and q is false. Its contrapositive "if not q then not p" always says the same thing. Its converse "if q then p" and inverse "if not p then not q" may not.