横式计算
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/11 18:51:04
横式计算
1.67 ×21 +18 ×21 + 85 ×79
2.375 ×480 + 6250 ×48
3.321 ×81 + 321 ×19
4.222222 ×999999
5.333333 ×333333
6.654321 ×909090 +654321 ×90909
7.34 ×3535 -35 ×3434
8.345345 ÷15015
9.75 ×45 + 17 ×25
10.(48 ×75 ×81)÷(24 ×25 ×27)
【答案详解】
1.67 ×21 +18 ×21 + 85 ×79
=21×(67+18)+85×79
=21×85+85×79
=85×(21+79)
=8500
2.375 ×480 + 6250 ×48
=480×(375+625)
=480000
3.321 ×81 + 321 ×19
=321×(81+19)
=32100
4.222222 ×999999
=222222×(1000000-1)
=222222000000-222222
=222221777778
5.333333 ×333333
=111111×999999
=111111×(1000000-1)
=111111000000-111111
=111110888889
6.654321 ×909090 +654321×90909
=654321×999999
=654321×(100000-1)
=654321000000-654321
=654320345679
7.34 ×3535 -35 ×3434
=34×35×101-35×34×101
=0
8.345345 ÷15015
=345×1001÷(15×1001)
=345÷15×1001÷1001
=23
9.75 ×45 + 17 ×25
=25×3×45+17×25
=25×(135+17)
=25×152
=25×4×38
=3800
10.(48 ×75 ×81)÷(24 ×25 ×27)
=48÷24×75÷25×81÷27
=2×3×3
=18
2.375 ×480 + 6250 ×48
3.321 ×81 + 321 ×19
4.222222 ×999999
5.333333 ×333333
6.654321 ×909090 +654321 ×90909
7.34 ×3535 -35 ×3434
8.345345 ÷15015
9.75 ×45 + 17 ×25
10.(48 ×75 ×81)÷(24 ×25 ×27)
【答案详解】
1.67 ×21 +18 ×21 + 85 ×79
=21×(67+18)+85×79
=21×85+85×79
=85×(21+79)
=8500
2.375 ×480 + 6250 ×48
=480×(375+625)
=480000
3.321 ×81 + 321 ×19
=321×(81+19)
=32100
4.222222 ×999999
=222222×(1000000-1)
=222222000000-222222
=222221777778
5.333333 ×333333
=111111×999999
=111111×(1000000-1)
=111111000000-111111
=111110888889
6.654321 ×909090 +654321×90909
=654321×999999
=654321×(100000-1)
=654321000000-654321
=654320345679
7.34 ×3535 -35 ×3434
=34×35×101-35×34×101
=0
8.345345 ÷15015
=345×1001÷(15×1001)
=345÷15×1001÷1001
=23
9.75 ×45 + 17 ×25
=25×3×45+17×25
=25×(135+17)
=25×152
=25×4×38
=3800
10.(48 ×75 ×81)÷(24 ×25 ×27)
=48÷24×75÷25×81÷27
=2×3×3
=18