Р=18х
меньш.сторона = 4х => 18х/ 4х = 9/2 ( или 4.5)
(-6 8/60-1 5/60+13/60):0,5+11 -7:0,5+11 -3 3 *100
______________________________ = ____________ =_____ = - ________
3,12 - 1,88 1,24 1,24 124
75
=- ___= - 2 13/31
31
1)284+739=1023
2)500-245=255
3)810-625=185
4)1023-255=768
5)768+185=953
1)210+753=963
2)963-529=434
3)346+434=780
4)780-198=582
Sin a •cos a ÷sin a - cos a + 1 = cos a - cos a + 1 = 1