题目内容
【题目】简算。
8.96-(4.96+0.72) 12.34-(2.34-1.99) 37.34-5.55-4.45
25×(8×4) 3.24×101 99×32+3.2×10
287×29+287+287×71 48×7+4.8×13×10 3.64+12.75+5.36-7.25
【答案】3.28 11.99 27.34
800 327.24 3200
28987 960 14.5
【解析】
8.96-(4.96+0.72)
=8.96-4.96-0.72
=4-0.72
=3.28
12.34-(2.34-1.99)
=12.34-2.34+1.99
=10+1.99
=11.99
37.34-5.55-4.45
=37.34-(5.55+4.45)
=37.34-10
=27.34
25×(8×4)
=25×8×4
=25×4×8
=800
3.24×101
=3.24×(100+1)
=3.24×100+3.24
=324+3.24
=327.24
99×32+3.2×10
=99×32+32
=32×(99+1)
=32×100
=3200
287×29+287+287×71
=287×(29+1+71)
=287×101
=287×(100+1)
=28700+287
=28987
48×7+4.8×13×10
=48×7+4.8×10×13
=48×7+48×13
=48×(7+13)
=960
3.64+12.75+5.36-7.25
=3.64+5.36+(12.75-7.25)
=9+5.5
=14.5
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【题目】如表是小明家五~七月份的缴费记录,请把表格填写完整。
电费(元) | 水费(元) | 电话费(元) | 合计(元) | |
五月份 | 21.5 | 34.7 | 41.5 | |
六月份 | 28.7 | 37.8 | ||
七月份 | 35.4 | 37.2 | ||
总计(元) | 98.2 | 131.7 |