用简便方法计算.768-137-63 26+138+64+62 88×125 102×34 42×7×5 300÷25÷
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:2024/11/12 05:01:38
用简便方法计算. 768-137-63 | 26+138+64+62 |
88×125 | 102×34 |
42×7×5 | 300÷25÷4 |
63×16-63×6 | 99×46+46. |
(1)768-137-63
=768-(137+63)
=768-200
=568
(2)26+138+64+62
=(26+64)+(138+62)
=90+200
=290
(3)88×125
=(80+8)×125
=80×125+8×125
=10000+1000
=11000
(4)102×34
=(100+2)×34
=100×34+2×34
=3400+68
=3468
(5)42×7×5
=42×5×7
=210×7
=1470
(6)300÷25÷4
300÷(25×4)
=300÷100
=3
(7)63×16-63×6
=63×(16-6)
=63×10
=630
(8)99×46+46
=(99+1)×46
=100×46
=4600.
=768-(137+63)
=768-200
=568
(2)26+138+64+62
=(26+64)+(138+62)
=90+200
=290
(3)88×125
=(80+8)×125
=80×125+8×125
=10000+1000
=11000
(4)102×34
=(100+2)×34
=100×34+2×34
=3400+68
=3468
(5)42×7×5
=42×5×7
=210×7
=1470
(6)300÷25÷4
300÷(25×4)
=300÷100
=3
(7)63×16-63×6
=63×(16-6)
=63×10
=630
(8)99×46+46
=(99+1)×46
=100×46
=4600.
用简便方法计算.768-137-63 26+138+64+62 88×125 102×34 42×7×5 300÷25÷
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