2442﹣1478= , 2442﹣964=
0.21×1.211.21 716×0.25716×4
14.1×2.128 2.03×0.010.203
5.4×0.90.9×5.4 6.8×1.026.8
2-1.2= 1.25×80= 6.6÷0.33= 2.5×2= 240×30=
1- = + = - = + = + =
+ = + = 1- - = -( - )=
综合算式: