5.24+3.17= 9.8-0.98=
3.6×5÷3.6×5= 3.5÷3.5-0. 42=
0.52×3.25 ≈(按四舍五入法将得数精确到十分位) 2.95÷1.1 (商用循环小数的简便方法表示)
①3.6÷(1.1+0.7)×12.9
②24.67-17.59+65.23-30.41
③78×0.25×4×2
④29×16.5-(7.8+5.3)
⑤3.5×3.5+3.5×7.5 -3.5
⑥(3.2+0.808)÷0.08