比一比,看谁做得又对又快!2+3= 6-3= 7-4=4+2= 3+3= 4+5=5-2= 6-5= 3+4=6+l= 8-5= 2+4=8-4= 5-4= 7-3=
2(200-15x)=70+25x 3(2x+1)=12
0.92×1.41+0.92×8.59 ×-×1.3×11.6-1.6×1.3 ×11.6+18.4×
13×÷ 29÷×15.68+(5.39+4.32) 19.68-(2.97+9.68) 7+(-) 5-(-)
1-- 41.06-19.72-20.287-3+ 8+2-11+7+3 700÷14÷518.6÷2.5÷0.4 1.06×2.5×4
102×7.3÷5.1 17+-7