用简便方法计算谢谢
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①1.25x8.08
=1.25x(8+0.08)
=1.25x8+1.25x0.08
=10+0.1
=10.1
②2.5x3.2x12.5
=(2.5x0.4)x(12.5x8)
=1x100
=100
③0.78x99
=0.78x(100—1)
=0.78x100—0.78
=78—0.78
=77.22
④1.01x5.6
=(1+0.01)x5.6
=5.6+5.6x0.01
=5.6+0.056
=5.656
⑤(12.5+1.25+0.125)x8
=12.5x8+1.25x8+0.125x8
=100+10+1
=111
⑥10.56—(3.22+4.56)
=10.56—4.56—3.22
=6—3.22
=2.78
=1.25x(8+0.08)
=1.25x8+1.25x0.08
=10+0.1
=10.1
②2.5x3.2x12.5
=(2.5x0.4)x(12.5x8)
=1x100
=100
③0.78x99
=0.78x(100—1)
=0.78x100—0.78
=78—0.78
=77.22
④1.01x5.6
=(1+0.01)x5.6
=5.6+5.6x0.01
=5.6+0.056
=5.656
⑤(12.5+1.25+0.125)x8
=12.5x8+1.25x8+0.125x8
=100+10+1
=111
⑥10.56—(3.22+4.56)
=10.56—4.56—3.22
=6—3.22
=2.78
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没有最简单,用计算器最简单
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1.25X8.08
=1.25X8+1.25X0.08
=10+0.1
=10.01
2.5X3.2X12.5
=2.5X4X(0.8X12.5)
=10X10
=100
0.78X99
=0.78X100-0.78X1
=78-0.78
=77.22
1.01X5.6
=1X5.6+0.01X5.6
=5.6+0.056
=5.656
(12.5+1.25+0.125)X8
=12.5X8+1.25X8+0.125X8
=100+10+1
=111
10.56-(3.22+4.56)
=(10.56-4.56)-3.22
=6-3.22
=2.78
=1.25X8+1.25X0.08
=10+0.1
=10.01
2.5X3.2X12.5
=2.5X4X(0.8X12.5)
=10X10
=100
0.78X99
=0.78X100-0.78X1
=78-0.78
=77.22
1.01X5.6
=1X5.6+0.01X5.6
=5.6+0.056
=5.656
(12.5+1.25+0.125)X8
=12.5X8+1.25X8+0.125X8
=100+10+1
=111
10.56-(3.22+4.56)
=(10.56-4.56)-3.22
=6-3.22
=2.78
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