小学方程、简便运算.简便运算:7.2÷0.4-7.2×0.4 55.55×55+45.45×55-55方程:4x-2(100-x)=40
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![小学方程、简便运算.简便运算:7.2÷0.4-7.2×0.4 55.55×55+45.45×55-55方程:4x-2(100-x)=40](/uploads/image/z/1068943-31-3.jpg?t=%E5%B0%8F%E5%AD%A6%E6%96%B9%E7%A8%8B%E3%80%81%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97.%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%EF%BC%9A7.2%C3%B70.4-7.2%C3%970.4++++++55.55%C3%9755%2B45.45%C3%9755-55%E6%96%B9%E7%A8%8B%EF%BC%9A4x-2%EF%BC%88100-x%EF%BC%89%3D40)
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小学方程、简便运算.简便运算:7.2÷0.4-7.2×0.4 55.55×55+45.45×55-55方程:4x-2(100-x)=40
小学方程、简便运算.
简便运算:
7.2÷0.4-7.2×0.4 55.55×55+45.45×55-55
方程:
4x-2(100-x)=40
小学方程、简便运算.简便运算:7.2÷0.4-7.2×0.4 55.55×55+45.45×55-55方程:4x-2(100-x)=40
7.2÷0.4-7.2×0.4=18-2.88
=15.12
55.55×55+45.45×55-55
=55x(55.55+45.45-1)
=55x100
=5500
4x-2(100-x)=40
4x-200+2x=40
6x=200+40
x=40