计算:①213-1.75=______;②30128×129=______;③(17×8+18×9+19×10)÷17×8×9=______;④30×29-29×28+28×27-27×26+…+4×3-3×2=______.⑤1÷(1-12)×(1+12)÷(1-13)×(1+13)÷…÷(1-110)×(-数学
题文
计算: ①2
③(
④30×29-29×28+28×27-27×26+…+4×3-3×2=______. ⑤1÷(1-
⑥方程:65%(x-1)=37%(x+1)+0.1的解是x=______. |
答案
①2
=2
=
②30
=(29+
=29×
=1+
=1
③(
|