简便计算
12.5×9.6×2.5×1512.5×4.8+2.5×4.482.2×10.4-0.887.3×285-73×16.5-730怎样简便计算...
12.5×9.6×2.5×15 12.5×4.8+2.5×4.48 2.2×10.4-0.88 7.3×285-73×16.5-730 怎样简便计算
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12.5×9.6×2.5×15
=12.5x8x(4x2.5)x(0.3x15)
=100x10x4.5
=4500
12.5×4.8+2.5×4.48
=12.5x8x.0.6+2.5x4x1.12
=100x0.6+10x1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2x10+2.2x0.4-0.88
=22+0.88-0.88
=22
7.3×285-73×16.5-730
=73x28.5-73x16.5-73x10
=73x(28.5-16.5-10)
=73x2
=146
=12.5x8x(4x2.5)x(0.3x15)
=100x10x4.5
=4500
12.5×4.8+2.5×4.48
=12.5x8x.0.6+2.5x4x1.12
=100x0.6+10x1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2x10+2.2x0.4-0.88
=22+0.88-0.88
=22
7.3×285-73×16.5-730
=73x28.5-73x16.5-73x10
=73x(28.5-16.5-10)
=73x2
=146
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涉及小数的计算,一般需要比较形式,寻找特殊的式子,如2.5×4=10,1.25×8=10,1.7-0.7=1等等这一类。因此可通过以下算法进行简便运算:
12.5×9.6×2.5×15
=12.5×(8×4×0.3)×2.5×15
=(12.5×8)×(2.5×4)×0.3×15
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=12.5×8×0.6+2.5×4×1.12
=100×0.6+10×1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2×10.4-2.2×0.4
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=73×28.5-73×16.5-73×10
=73×(28.5-16.5-10)
=73×2
=146
12.5×9.6×2.5×15
=12.5×(8×4×0.3)×2.5×15
=(12.5×8)×(2.5×4)×0.3×15
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=12.5×8×0.6+2.5×4×1.12
=100×0.6+10×1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2×10.4-2.2×0.4
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=73×28.5-73×16.5-73×10
=73×(28.5-16.5-10)
=73×2
=146
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12.5×9.6×2.5×15
=12.5×8×2.5×4×15×0.3
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=2.5×5×4.8+2.5×4.48
=2.5×24+2.5+4.48
=2.5×28.48
=71.2
2.2×10.4-0.88
=2.2×10.4-2.2×0.4
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=7.3×285-7.3×165-7.3×100
=7.3×(285-165-100)
=7.3×20
=146
=12.5×8×2.5×4×15×0.3
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=2.5×5×4.8+2.5×4.48
=2.5×24+2.5+4.48
=2.5×28.48
=71.2
2.2×10.4-0.88
=2.2×10.4-2.2×0.4
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=7.3×285-7.3×165-7.3×100
=7.3×(285-165-100)
=7.3×20
=146
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12.5×9.6×2.5×15
=(12.5×8)×(4×2.5)×(0.3×15 )
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=12.5×8×0.6+2.5×4×1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=7.3×285-7.3×165-7.3 ×100
=7.3×(285-165-100)
=7.3×20
=146
=(12.5×8)×(4×2.5)×(0.3×15 )
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=12.5×8×0.6+2.5×4×1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=7.3×285-7.3×165-7.3 ×100
=7.3×(285-165-100)
=7.3×20
=146
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12.5×9.6×2.5×15
=12.5×(8×4×0.3)×2.5×15
=(12.5×8)×(2.5×4)×0.3×15
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=12.5×8×0.6+2.5×4×1.12
=100×0.6+10×1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2×10.4-2.2×0.4
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=73×28.5-73×16.5-73×10
=73×(28.5-16.5-10)
=73×2
=146
=12.5×(8×4×0.3)×2.5×15
=(12.5×8)×(2.5×4)×0.3×15
=100×10×4.5
=4500
12.5×4.8+2.5×4.48
=12.5×8×0.6+2.5×4×1.12
=100×0.6+10×1.12
=60+11.2
=71.2
2.2×10.4-0.88
=2.2×10.4-2.2×0.4
=2.2×(10.4-0.4)
=2.2×10
=22
7.3×285-73×16.5-730
=73×28.5-73×16.5-73×10
=73×(28.5-16.5-10)
=73×2
=146
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