20.直接写出得数.
0 157754 157762 157768 157772 157778 157780 157784 157790 157792 157798 157804 157808 157810 157814 157820 157822 157828 157832 157834 157838 157840 157844 157846 157848 157849 157850 157852 157853 157854 157856 157858 157862 157864 157868 157870 157874 157880 157882 157888 157892 157894 157898 157904 157910 157912 157918 157922 157924 157930 157934 157940 157948 199269
2.8+4= | 0.7+0.6= | 3-0.4= | 0.89-0.5= |
25×8= | 36×5= | 36÷4×5= | 24-8+10= |