205-199= 0.4-0.22= 0.52= = 2+2÷ =
36× = 2+ = 2.5×1.3×0.4= ÷0.6= 7× ÷7× =
19﹣1.7= 2.4÷0.04= 496+298= ×0.2=
9.7+0.03= ÷1.75= 1×÷= +÷+=
763-197= 76-0.6= 1.03-0.54= 5.7÷0.1= -6÷7=
1÷1%= 0.57×0.3= 2.323÷23=
0.48÷0.3= 2.5×40= 7÷19=
11×11-11=
①9.9×99+9.9=
②0.82﹣0.22=
③8÷ ﹣4=
④ ﹣( + )=
⑤9.625﹣ =
⑥3.5÷ × =
正确计算:
错误的原因:
避免错误的方法:
=1×24
=24
解: (45%+30%) x=4.5
75%x=4.5
x=0.06
正确计算:45%+30%x=4.5
145+398= 6-0.6= 0.24×50= 3﹣3÷7= (+)×56=
1.25×6×8= = = ÷0.75= ×4÷×4=