4.5+0.55= 16.5-5= 0.03×10=
1.06÷100= 3.5+5= 6.8-4.9=
25×7×4= 6.5+3.7+3.5= 68.4-23.6-18.4=
①73000÷125
②9000÷8÷125
③6200÷(5×62)
④510÷34+ 17
⑤45×71+29×45
⑥54×63+38×54-54