+3.2++6.8 906×99+906 0.25×+×
8.7+30.75÷2.5 (2.6+4.8)×(2.6﹣2.1) (+×)÷
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①8×2.5×0.125÷
②(+﹣)×24
③6.5÷×
④(+)×+
⑤4×(﹣)×9
⑥÷7+×
①772-317+128-283
②2.4÷( -20%)
③1-
④5.125× +2.875÷4
⑤