x
a
2.7
y
6
9
56 0.97 + - 0 -0.02 +63%
正数:负数:
①976+829+24
②42÷()
③13.2×0.44+13.2×0.56
2.5×(1.9+1.9+1.9+1.9) 160×3.5×0.125
24×+72÷5+14×20% 18×4.3+36×2.05+×32
420﹣298= 4+5.6= = =
0.25×0.4= 0.133= = =