1.1+1.2+1.3+……+8.8+8.9.
1999+199.9+19.99+1.999+0.1999
268×45 =
59×705 =
470×68 =
134+269+166
228+(247+172)
356+72+44+128+39
2024+133-924+167
①(124﹣85)×12÷26
②(59+21)×(96÷8)
③1.3+14.6﹣5.6+8.7
④(40+8)×125
⑤125×88×7
⑥34×89+34×12﹣34