①1.9x﹣1.7x=80.4
② =
③5.6x﹣ x=4.8
④5x+ =
× =
6﹣4.92=
25×0.7×4=
+0.5=
3- =
6.3÷0.21=
1﹣1÷ =
(0.6- )×16=
①8×1.25=
②678+206=
③+=
④×7.2=
⑤3.2a﹣a=
⑥2.875+
⑦18.23﹣2.3=
⑧3÷=
⑨633÷91≈
⑩59×42≈
① x+ x=26
②5.1:x=1.7:3
③ x﹣ ×6=
52÷4=13
13-3=10
423-300=123
123÷41=3
- =
÷ =