(10×71+11×72+12×73+13×74+14×75+15×76)—(10×70+11×71+12×72+13×73+14×74+15×75)=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 09:26:02
![(10×71+11×72+12×73+13×74+14×75+15×76)—(10×70+11×71+12×72+13×73+14×74+15×75)=?](/uploads/image/z/1068755-59-5.jpg?t=%EF%BC%8810%C3%9771%2B11%C3%9772%2B12%C3%9773%2B13%C3%9774%2B14%C3%9775%2B15%C3%9776%EF%BC%89%E2%80%94%EF%BC%8810%C3%9770%2B11%C3%9771%2B12%C3%9772%2B13%C3%9773%2B14%C3%9774%2B15%C3%9775%EF%BC%89%3D%3F)
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(10×71+11×72+12×73+13×74+14×75+15×76)—(10×70+11×71+12×72+13×73+14×74+15×75)=?
(10×71+11×72+12×73+13×74+14×75+15×76)—(10×70+11×71+12×72+13×73+14×74+15×75)=?
(10×71+11×72+12×73+13×74+14×75+15×76)—(10×70+11×71+12×72+13×73+14×74+15×75)=?
把括号去掉,再把10 11 12 13 14 15 分别提出 最后就是10+11+12+13+14+15了 等于 70