20.怎样简便就怎样算
2.37+1.75+9.63+0.25 | $\frac{8}{9}$÷$\frac{5}{4}$×$\frac{5}{16}$ | 7.8×$\frac{3}{4}$-2.6×$\frac{3}{4}$ |
35÷$\frac{7}{8}$×1-$\frac{3}{7}$ | 90-32.4÷81×20 | $\frac{1}{6}$×$\frac{2}{5}$÷($\frac{5}{6}$-$\frac{3}{4}$) |
19.直接写出得数
0 159965 159973 159979 159983 159989 159991 159995 160001 160003 160009 160015 160019 160021 160025 160031 160033 160039 160043 160045 160049 160051 160055 160057 160059 160060 160061 160063 160064 160065 160067 160069 160073 160075 160079 160081 160085 160091 160093 160099 160103 160105 160109 160115 160121 160123 160129 160133 160135 160141 160145 160151 160159 199269
$\frac{1}{3}$-$\frac{1}{4}$= | 4÷$\frac{1}{4}$= | $\frac{7}{8}$×$\frac{3}{14}$= | 3.14×102= | 1.2×2×0.5= |
$\frac{4}{5}$÷8= | 6×2.5= | 1÷$\frac{3}{8}$= | 7.5×10%= | 17×18×($\frac{1}{17}$+$\frac{1}{18}$)= |