直接写得数:4.2+5.08= 7.2÷0.072= 4.3﹣3= 0.75÷1.5=3.6×0.7÷3.6×0.7= 1.05﹣0.95= 2.5×4= 2.5×2.4=3.2﹣1.34﹣1.66= 1÷1.25÷4= 12.8﹣0.28= 1.25×0.8=8.4×5= 5.6﹣5.6÷7= 0.8+0.2﹣0.8+0.2=
神思妙算对又巧. ①85.87﹣(5.87+2.9)②(+)×13×29.
简便计算 27.2﹣4.42﹣2.58 38.3+45.5﹣8.399×37+3798×45.
0.25×12.5×32﹣8.88×1.25.
计算:0.178×72.6+1.78×2.74= .
计算:6.25×20.16﹣l8.75×3.12+12.5×2.6= .