+ = - = 42= 2.4x+6x= =(小数)
1- = + = 0.12= x- x= 0.125=(分数)
= = 1- = 7÷11=
63= 3÷0.01= + = 1- =
+ = - = 5+ = - =
① + +
② - +
③ + + +
④ -( + )
⑤ - -
⑥ +( - )
- = + = - =
+ = - = - =
= 3.15+ = = -0.35+ =
13÷52= = 2- = =