Question

用简便方法计算102x28

Answer 1

用简便方法计算102x28

102×28
=（100+2）×28
=100×28+2×28
=2800+56
=2856

用简便方法计算102x21

102x21
=（100+2）x21
=（100x21）+(2x21)
=2100+42
=2142

用简便方法计算102x24-48

102x24-48
=102x24-2x24
=（102-2）x24
=100x24=2400
或102x24-48
=（100+2）x24-48
=100x24+2x24-48
=2400+48-48
=2400
希望能帮到你！

用简便方法计算42x28+56x28+28x2

用简便方法计算
42x28+56x28+28x2
=28×(42+56+2)
=28×100
=2800

用简便方法计算102x20一2x20

102x20-2x20
=20x(102-2)
=20x100
=2000

72x26+26x28用简便方法计算

72x26+26x28
=（72+28）x26
=100x26
=2600

72x26+36x28用简便方法计算

原式=72×26+（26+10）×28
=72×26+26×28+10×28
=（72+28）×26+280
=100×26+280
=2600+280
=2880

12x102x24的简便方法计算

简便方法计算
12x102x24
=（12×24）x102
=288×（100+2）
=288×100+288×2
=28800+576
=29376