①18×0.45=
②45.9÷0.15=
③7.35÷2.1=
④6.6÷9.9=
①14.56﹣6.62+5.44﹣8.38
②×0.8×12.5
③5.9×63+59×3.7
④÷[×(﹣)]
①210÷35+12×109
②2.5×1.25×16
③()×12
④ [()]