①4000÷25+15×24
②3÷ - ÷3
③[1+( - )]×
④( + - )÷
⑤19.43﹣(9.43+6.89)
⑥( + )×4+
40×25%= 1.03×10= 3×45= 1÷10%= 2.8×=
1.57﹣0.85= 0.49÷0.7= 3.05+6.2= 0.6:0.75= kg:40g=
×=
0.53+0.47=
25×40%=
①
②
③
④
①15.28﹣3.6﹣3.4
②()×7.2
④7.5÷[(6.8﹣4.3)×0.12]