7.8×6.9+2.2×6.9
5.6×0.25
8×(20- 1.25) 1.65×99+ 1.65
27.85-(7.85+3.4)
48× 1.25+50× 1.25×0.2×8
7.8×9.9+0.78
( 10 10+309+4+68 1+6)× 12
3×9 146×782×6×854
5. 15×7/8+6. 1-0.60625
920- 1680÷40÷7
690+47×52-398
148+3328÷64-75
360×24÷32+730
2 100-94+48×54
5 1+(2304-2042)×23
42 15+(436 1-7 16)÷8 1
(247+ 18)×27÷25
36-720÷(360÷ 18)