能简便的用简便方法计算. 0.88×4.9+5.1×0.88 2.5×8×0.4×0.125 0.65×201 21.36÷0.8﹣12.9 0.25×1.25×3.2 7.28+3.2÷2.5.
19+11= 19+13= 19+15= 19+17= 19+19= 19+21= 奇数+奇数=()
9+1= 9+3= 9+5= 9+7= 9+9= 9+11= 奇数+奇数=()
18+22= 18+24= 18+26= 18+28= 18+30= 18+32= 偶数+偶数=()
8+22= 8+24= 8+26= 8+28= 8+30= 8+32= 偶数+偶数=()
8+2= 8+4= 8+6= 8+8= 8+10= 8+12= 偶数+偶数=()