数学题 快来人啊2/5*7.6+0.4*0.4 9.75-5/7+1/4-2/74/9[3/4-(7/16-0.25)] 16*2/3*(9*1/8)
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/25 03:38:17
数学题 快来人啊2/5*7.6+0.4*0.4 9.75-5/7+1/4-2/74/9[3/4-(7/16-0.25)] 16*2/3*(9*1/8)
数学题 快来人啊
2/5*7.6+0.4*0.4 9.75-5/7+1/4-2/7
4/9[3/4-(7/16-0.25)] 16*2/3*(9*1/8)
数学题 快来人啊2/5*7.6+0.4*0.4 9.75-5/7+1/4-2/74/9[3/4-(7/16-0.25)] 16*2/3*(9*1/8)
2/5*7.6+0.4*0.4
=0.4*7.6+0.4*0.4
=0.4*(7.6+0.4)
=0.4*8
=3.2
9.75-5/7+1/4-2/7
=(9.75+1/4)-(5/7+2/7)
=10-1
=9
4/9[3/4-(7/16-0.25)]
=4/9*[3/4-7/16+0.25]
=4/9*[3/4+1/4-7/16]
=4/9*[1-7/16]
=4/9*9/16
=1/4
16*2/3*(9*1/8)
=16*2/3*9*1/8
=(16*1/8)*(2/3*9)
=2*6
=12
1、3.2 ；2、9；
3、1/12；4、12.
1、3.2
2、9
3、0.25
4、12
2/5*7.6+0.4*0.4
=2/5*（7.6+0.4）
=2/5*8
=3.2
9.75-5/7+1/4-2/7
=（9.75+1/4）-（5/7+2/7）
=10-1
=9
4/9*[3/4-(7/16-0.25)]
=4/9*[3/4+0.25-7/16]
=4/9*[1-7/16]
=4/9*9/16
=1/4
16*2/3*(9*1/8)
=(16*1/8)*(2/3*9)
=2*6
=12
你好！【要过程吗？】
1.15.36
2.268/28
2/5*7.6+0.4*0.4
=0.4×7.6+0.4×0.4
=0.4×(7.6+0.4)
=0.4×8
=3.2
9.75-5/7+1/4-2/7
=9.75-5/7+0.25-2/7
=9.75+0.25-(5/7+2/7)
=10-1
=9
4/9[3/4-(7/16-0.25)] <...
全部展开
2/5*7.6+0.4*0.4
=0.4×7.6+0.4×0.4
=0.4×(7.6+0.4)
=0.4×8
=3.2
9.75-5/7+1/4-2/7
=9.75-5/7+0.25-2/7
=9.75+0.25-(5/7+2/7)
=10-1
=9
4/9[3/4-(7/16-0.25)]
=4/9(3/4-7/16+1/4)
=4/9(3/4+1/4-7/16)
=4/9(1-7/16)
=4/9×9/16
=1/4
16*2/3*(9*1/8)
=16×2/3×9×1/8
=16×1/8×(2/3×9)
=2×6
=12
收起