数学题(求详细算式,每步意义)请解答.能简便的要简便计算18.79-(4.79+19/5)-0.4=(?)57+29/8-59/12=?19/60+(7/5-49/15)=(?)731/30-15+37/6=(?)23/5-(7.2-13/4)=(?)17/3+63/10+10/3+2.7=(?)3.82+(59/8-2.82)-23/4解方程X-83/9=21
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![数学题(求详细算式,每步意义)请解答.能简便的要简便计算18.79-(4.79+19/5)-0.4=(?)57+29/8-59/12=?19/60+(7/5-49/15)=(?)731/30-15+37/6=(?)23/5-(7.2-13/4)=(?)17/3+63/10+10/3+2.7=(?)3.82+(59/8-2.82)-23/4解方程X-83/9=21](/uploads/image/z/8751779-35-9.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%88%E6%B1%82%E8%AF%A6%E7%BB%86%E7%AE%97%E5%BC%8F%2C%E6%AF%8F%E6%AD%A5%E6%84%8F%E4%B9%89%EF%BC%89%E8%AF%B7%E8%A7%A3%E7%AD%94.%E8%83%BD%E7%AE%80%E4%BE%BF%E7%9A%84%E8%A6%81%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%9718.79-%EF%BC%884.79%2B19%2F5%EF%BC%89-0.4%3D%28%3F%2957%2B29%2F8-59%2F12%3D%3F19%2F60%2B%EF%BC%887%2F5-49%2F15%EF%BC%89%3D%28%3F%29731%2F30-15%2B37%2F6%3D%28%3F%2923%2F5-%287.2-13%2F4%29%3D%28%3F%2917%2F3%2B63%2F10%2B10%2F3%2B2.7%3D%28%3F%293.82%2B%2859%2F8-2.82%EF%BC%89-23%2F4%E8%A7%A3%E6%96%B9%E7%A8%8BX-83%2F9%3D21)
数学题(求详细算式,每步意义)请解答.能简便的要简便计算18.79-(4.79+19/5)-0.4=(?)57+29/8-59/12=?19/60+(7/5-49/15)=(?)731/30-15+37/6=(?)23/5-(7.2-13/4)=(?)17/3+63/10+10/3+2.7=(?)3.82+(59/8-2.82)-23/4解方程X-83/9=21
数学题(求详细算式,每步意义)请解答.
能简便的要简便计算
18.79-(4.79+19/5)-0.4=(?)
57+29/8-59/12=?
19/60+(7/5-49/15)=(?)
731/30-15+37/6=(?)
23/5-(7.2-13/4)=(?)
17/3+63/10+10/3+2.7=(?)
3.82+(59/8-2.82)-23/4
解方程
X-83/9=21/5
3/4+X+0.25
数学题(求详细算式,每步意义)请解答.能简便的要简便计算18.79-(4.79+19/5)-0.4=(?)57+29/8-59/12=?19/60+(7/5-49/15)=(?)731/30-15+37/6=(?)23/5-(7.2-13/4)=(?)17/3+63/10+10/3+2.7=(?)3.82+(59/8-2.82)-23/4解方程X-83/9=21
18.79-(4.79+19/5)-0.4
第一个数值和第二个数值小数部分一样
第三个数值和第四个数值化成分数分母一样 =18.79-4.79-19/5-2/5
故去括号 把第四个化为分数
运用结合律 加括号 =(18.79-4.79)-(19/5+2/5)
计算 =14-21/5
进一步计算 =9.8
简便计算都换成小数,然后小数点后的统一加起来,前面加起来,两个最后加起来。
解方程同理
投入费用trytry特