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简便计算.1.5×1021.25×0.7×0.82.7×3.7+0.37×738.7×990.8×(12.5-1.25)1.25×0.4×80×2.5.
题目详情
简便计算.
1.5×102
1.25×0.7×0.8
2.7×3.7+0.37×73
8.7×99
0.8×(12.5-1.25)
1.25×0.4×80×2.5.
1.5×102
1.25×0.7×0.8
2.7×3.7+0.37×73
8.7×99
0.8×(12.5-1.25)
1.25×0.4×80×2.5.
▼优质解答
答案和解析
(1)1.5×102
=1.5×(100+2)
=1.5×100+1.5×2
=150+3
=153
(2)1.25×0.7×0.8
=(1.25×0.8)×0.7
=1×0.7
=0.7
(3)2.7×3.7+0.37×73
=2.7×3.7+3.7×7.3
=3.7×(2.7+7.3)
=3.7×10
=37
(4)8.7×99
=8.7×(100-1)
=8.7×100-8.7×1
=870-8.7
=861.3
(5)0.8×(12.5-1.25)
=0.8×12.5-0.8×1.25
=10-1
=9
(6)1.25×0.4×80×2.5
=(1.25×80)×(0.4×2.5)
=100×1
=100
=1.5×(100+2)
=1.5×100+1.5×2
=150+3
=153
(2)1.25×0.7×0.8
=(1.25×0.8)×0.7
=1×0.7
=0.7
(3)2.7×3.7+0.37×73
=2.7×3.7+3.7×7.3
=3.7×(2.7+7.3)
=3.7×10
=37
(4)8.7×99
=8.7×(100-1)
=8.7×100-8.7×1
=870-8.7
=861.3
(5)0.8×(12.5-1.25)
=0.8×12.5-0.8×1.25
=10-1
=9
(6)1.25×0.4×80×2.5
=(1.25×80)×(0.4×2.5)
=100×1
=100
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