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简便计算,(只用做有简便的,

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/24 21:07:44
简便计算,(只用做有简便的,
 

 
102+7.5×36÷2.7 1.6×(21÷1.4)
=102+270÷2.7 =1.6×15
=102+100 =24
=202
0.25×3.2×12.5 3/4×(5/6-1/3+1/6)
=(0.25×4)×(0.8×12.5) =3/4×(5/6+1/6-1/3)
=1×10 =3/4×2/3
=10 =1/2
1.35-9/11+1.65-2/11 4/9×7/10+5/9÷10/7
=(1.35+1.65)-(9/11+2/11) =4/9×7/10+5/9×7/10
=3-1 =(4/9+5/9)×7/10
=2 =1×7/10
=7/10
X-25%=1/4
X=1/4+25%
X=1/2