怎么做？
7/20×99+7/20
=7/20×（99+1）
=7/20×100
=35
7/50×101-7/50
=7/50×（101-1）
=7/50×100
=14
0.125×2.5×32
=0.125×2.5×4×8
=（0.125×8）×（2.5×4）
=1×10
=10
0.25×72×4
=0.25×4×72
=1×72
=72
0.125×72
=0.125×8×9
=1×9
=9
43×19/42
=（42+1）×19/42
=42×19/42+11×9/42
=19+19/42
=19又19/42
4.8×（1/2+3/4）
=4.8×1/2+4.8×3/4
=2.4+3.6
=6
7×1/25+7/25×99
=7/25+7/25×99
=7/25×（1+99）
=7/25×100
=28
3/4×2/5+0.75×3/5
=0.75×2/5+0.75×3/5
=0.75×（2/5+3/5）
=0.75×1
=0.75
=7/20×（99+1）
=7/20×100
=35
7/50×101-7/50
=7/50×（101-1）
=7/50×100
=14
0.125×2.5×32
=0.125×2.5×4×8
=（0.125×8）×（2.5×4）
=1×10
=10
0.25×72×4
=0.25×4×72
=1×72
=72
0.125×72
=0.125×8×9
=1×9
=9
43×19/42
=（42+1）×19/42
=42×19/42+11×9/42
=19+19/42
=19又19/42
4.8×（1/2+3/4）
=4.8×1/2+4.8×3/4
=2.4+3.6
=6
7×1/25+7/25×99
=7/25+7/25×99
=7/25×（1+99）
=7/25×100
=28
3/4×2/5+0.75×3/5
=0.75×2/5+0.75×3/5
=0.75×（2/5+3/5）
=0.75×1
=0.75
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第1个回答 2022-04-14
解：7/50×101-7/50=7/50×(101-1)=7/50×100=14，运用乘法分配率逆运算，希望可以帮到你
第2个回答 2022-04-14
(1) 7/20x99+7/20
=7/20x(99+1)
=7/20x100
=7x50
=350。
(2) 7/50x101-7/50
=7/50x(101-1)
=7/50x100
=7x2
=14。
(3) 0.25x72x4
=(0.25x4)x72
=1x72
=72。
(4) 0.125x72
=0.125x8x7
=1x7
=7。
(5) 4.8x(1/2+3/4)
=4.8x1/2+4.8x3/4
=2.4+3.6
=6。
(6) 7x1/25+7/25x99
=7/25+7/25x99
=7/25x(1+99)
=7/25x100
=7x4
=28。
(7) 0.125x2.5x32
=0.125x2.5x8x4
=(0.125x8)x(2.5x4)
=1x10
=10。
(8) 43x19/42
=(42+1)x19/42
=42x19/42+1x19/42
=19+19/42
=19又19/42。
(9) 3/4x2/5x0.75x3/5
=0.75x2/5+0.75x3/5
=0.75x(2/5+3/5)
=0.75x1
=0.75。
=7/20x(99+1)
=7/20x100
=7x50
=350。
(2) 7/50x101-7/50
=7/50x(101-1)
=7/50x100
=7x2
=14。
(3) 0.25x72x4
=(0.25x4)x72
=1x72
=72。
(4) 0.125x72
=0.125x8x7
=1x7
=7。
(5) 4.8x(1/2+3/4)
=4.8x1/2+4.8x3/4
=2.4+3.6
=6。
(6) 7x1/25+7/25x99
=7/25+7/25x99
=7/25x(1+99)
=7/25x100
=7x4
=28。
(7) 0.125x2.5x32
=0.125x2.5x8x4
=(0.125x8)x(2.5x4)
=1x10
=10。
(8) 43x19/42
=(42+1)x19/42
=42x19/42+1x19/42
=19+19/42
=19又19/42。
(9) 3/4x2/5x0.75x3/5
=0.75x2/5+0.75x3/5
=0.75x(2/5+3/5)
=0.75x1
=0.75。
