1.
1.26*2.10≈2.646 1.26:2.10≈0.6
25,678*1.23≈31,58394 25,678:1.23≈20,876422
1,2*10²*3*10²≈3,6*10^4 1,2*10²:3*10²≈0.4
4.8*10²*1.33*10^-2≈6,384 4,8*10²:3*10^-2≈1,6*10^4
2
1,34*2,3\1,34²+2,3²≈3,082\7,0856≈0,4349666
3
1,9*6,3*3,05\5,3*125≈36,5085\662,5≈0,0551071≈0,055
0,85*12,6*5,05\0,0854*18,9≈54,0855\1,61406≈33,508977≈33,509