(2008•深圳) 我能很快算出下面的题目相信你也能行.
来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/11/14 13:52:27
(2008•深圳)
我能很快算出下面的题目相信你也能行. ①9
①9
2 5-(3 3 7+0.4), =9 2 5-3 3 7- 2 5, =(9 2 5- 2 5)-3 3 7, =9-3 3 7, =5 4 7; ②7.8× 1 5+2.2×20%, =7.8×0.2+2.2×0.2, =(7.8+2.2)×0.2, =10×0.2, =2; ③34.7- 7 15+65.3- 8 15, =(34.7+65.3)-( 7 15+ 8 15), =100-1, =99; ④( 3 4+ 11 6- 13 24)×12, = 3 4×12+ 11 6×12- 13 24×12, =9+22-6.5, =24.5; ⑤0.25×32×12.5, =0.25×4×8×12.5, =(0.25×4)×(8×12.5), =1×100, =100; ⑥ 7 12×[ 3 4-( 11 20- 1 2)], = 7 12×[ 3 4-( 11 20- 10 20)], = |