来自葛德田的问题
用简便方法计算1.2×2.5+2.8×2.54.8×2.526.34-0.36-5.64.
用简便方法计算
1.2×2.5+2.8×2.5
4.8×2.5
26.34-0.36-5.64.
1回答
2020-12-01 01:35
用简便方法计算1.2×2.5+2.8×2.54.8×2.526.34-0.36-5.64.
用简便方法计算
1.2×2.5+2.8×2.5
4.8×2.5
26.34-0.36-5.64.
(1)1.2×2.5+2.8×2.5 =2.5×(1.2+2.8)=2.5×4=10 (2)4.8×2.5 =4×1.2×2.5=4×2.5×1.2...