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1、第4课时解简易方程(1)不夯实基础,难建成高楼。1.看图列出方程。IJ一k2000.9 = 1.2 x+ 310= 6908.5+ x = 10.2 x 0.74 = 1.54. 在下面各方程后面的括号中,找出方程的解,并在内画“x+ 30= 100(x = 70口x = 130 )x 5.8 = 7(x = 1.2 x = 12.8 )& 1 + x = 9.9(x= 1.8 x = 18口)x 200= 210(x = 10口 x = 410 )重点难点,一网打尽。5. 解方程。4.8 x= 5.1x+26= 76x303= 428x 4.6 = 9x+22=78100x=1256. 先找
2、出错误原因,再改正。x 49= 51解: x= 51 49x= 100x2.7= 12.7解:x = 12.7 2.7x= 107. 根据图意列方程求x。(1)本书有皿贝61举一反三,应用创新,方能一显身手!8在() 里填上适当的数,使每个方程的解都是x=10。右边盘里应该放()个苹果。第 4 课时1. (1)45 + x = 200(2)5 x = 502. (1) V (2)V (3) X (4) X (5) X (6) V4. x = 70 x = 12.8x= 1.8x= 4105. x = 0.3 x = 50x= 125x= 13.6x= 56x= 256. 略7. (1) x+78= 185x= 107(2) x+3.5 =6 x=2.58. 81 1.1 9. 53. x = 49 x = 71 x = 2.1x = 380 x= 1.7 x = 2.24