①
②
③ ( )
④ ( )+( )
①1.7+3.98+5 +2.02
②13×50-618÷6
③(156× -26)×
④(1.5- )×(4- )
⑤
⑥
①
②
③
④
⑤
⑥
① + +
②1- -
③ + +
④ -( - )
⑤ + -
⑥1-( + )
① - +
② +( - )
③ - +
④ +( + )
⑤ -( + )
⑥4- -
⑦ +( - + )
⑧ + - +
① - +
② -( - )
③ - + -
④ + +
⑤7-( - )
⑥ + -
① + +
②1 - -
③ + -
④
⑤
⑥