125×5125÷5
515÷5505÷5
840÷4480÷4
420÷6420÷2÷3
315÷3720÷4
360÷3×2360÷3÷2
是由5个小拼成的.
230 + 350= 206×3 = 160+340 = 570-290 =
=
=
+
= 999 ×1 =
202× 9 ≈ 598-153 ≈ 390 × 5 ≈ 117 × 4 ≈
0.5+0.7= 12×20= 0÷7= 3.9-2.5=
3428+2957=( )