①5.8×1.01-9.9÷3.6
②3.8×6.5-6.5+6.5×7.2
③0.125×6.4×0.5
④[1÷(0.1×0.1)] ×4.9+5.1
1- = + = ×2= + = - =
18× = ÷6= ÷ = a-0.4a= + + + =
1.5
0.625
0.3
1.8
0.04
0.4
+ = - = + = 1- =
- = + = - = + =
382×101-382 81+9×91 682-(324-18)
1.25×2.5×3.2 12.13+7.15-1.13+2.85 99×1.2
56×1.25
21.36÷0.8﹣12.9
12.4÷(5.6﹣2.5)