2.4×0.3= 4.2÷3= 0.6a+5.4a= 0.3²= 3.2×4÷3.2×4=
6x-5x= + = = 6.4-2.12= 102×98≈
①x+ =
②x- =
③ +x=
④ -x=
⑤ = +x
⑥ +x=
11.6+4= 5.1-1.8= 27.84×10= +1.03=
32.5÷100= 298×61≈ 1- = 6.4+4.6-6.4+4.6=