1.43+0.2×0.5+1.57
÷[×(+)]
(÷﹣÷7)÷
÷[×(﹣)]
:x=: 3x﹣0.9=2.4 x+x=132
1÷= ×= += -=
A.(78-20÷2)×6 B.6×(78-20)÷2 C.6×78-20÷2 D.(6×78-20)÷2
= =
看的页数多。