-2 -1.5 2 +5 -3
①4.12+ 1.37+ 0.88 + 3.63
②3.12÷2.5÷0.4
③48×()
④802-11×36
⑤0.56÷ (0.71+ 2.09)
⑥
⑦(0.84÷0.4+ 2.9)×0.4
⑧
(+)×12=
÷=
×=
×8+8×=
-=
+=
26×=
x-20%x=80 2x+15=27 5x-0.2=0.8
4
7
3
2
6
9
1
8
5