7.8÷0.2=
×2-3.5=
12×(-)=
-+=
4×(1-10%)=
-62.5%=
+50%=
÷+×2=
①0.96×516÷15 ②49÷4+4÷49 ③2019×20192020
④1784×13+1384×25 ⑤(320+2.1)×47÷0.9 ⑥0.5+156÷(0.75+1920)
①125%+0.24×58 ②85×2943 ③5.04÷4.8+5.04÷1.2 ④59+13-227×2.7 ⑤4.2÷23×117÷75% ⑥36×34+34×63+34