㈠ 14乘以102用簡便方法計算
14*102
=14*(100+2)
=14*100+14*2
=1400+28
=1428
㈡ 14×102 120×15+15×80 303×21 67×99+67 38×62+38×38 的簡便運算怎麼寫啊 急需啊!!
14×102=14x(100+2)=14x100+14x2=1400+28=1428
120×15+15×80=15x(120+80)=15x200=3000
303×21=(300+3)x21=300x21+3x21=6363
67×99+67=67x(99+1)=67x100=6700
38×62+38×38=38x(62+38)=38x100=3800
㈢ 14×102怎樣算簡便
14*(100+2) =14*100+14*2 =1400+28 =1428
㈣ 用簡便方法計算102x28
102×28
=(100+2)×28
=100×28+2×28
=2800+56
=2856
102x21
=(100+2)x21
=(100x21)+(2x21)
=2100+42
=2142
102x24-48
=102x24-2x24
=(102-2)x24
=100x24=2400
或102x24-48
=(100+2)x24-48
=100x24+2x24-48
=2400+48-48
=2400
希望能幫到你!
用簡便方法計算
42x28+56x28+28x2
=28×(42+56+2)
=28×100
=2800
102x20-2x20
=20x(102-2)
=20x100
=2000
72x26+26x28
=(72+28)x26
=100x26
=2600
原式=72×26+(26+10)×28
=72×26+26×28+10×28
=(72+28)×26+280
=100×26+280
=2600+280
=2880
簡便方法計算
12x102x24
=(12×24)x102
=288×(100+2)
=288×100+288×2
=28800+576
=29376