直接写得数1.4+2.3= 12÷30= 630÷7= 10﹣5.3= 306÷3= 40×30=
2(200-15x)=70+25x3(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-- 41.06-19.72-20.28 7-3+ 8+2- 11+7+3 700÷14÷5 18.6÷2.5÷0.4 1.06×2.5×4
102×7.3÷5.1 17+-7