20.8= 54= 10.0300=
2.5×10= 65.8÷100= 1-0.37= 7.6÷10=
0.05×1000= 14×60= 0.5+0.4= 1.1+9=
①13-4.85-3.15
②12.5×7.6×0.8
③17.8+2.2×4.5
④6.15×10.1
⑤4.5×3.6+5.5×3.6
⑥12.73+6.2+6.27+3.8
∠C=
∠B=