1.25×0.25×8×40用简便方法计算 5.7×9.9 0.34×10.1
1.25×0.25×8×40用简便方法计算5.7×9.90.34×10.112.5×(10+0.8)44.5×3.7+6.3×44.5...
1.25×0.25×8×40用简便方法计算
5.7×9.9 0.34×10.1 12.5×(10+0.8)
44.5×3.7+6.3×44.5 展开
5.7×9.9 0.34×10.1 12.5×(10+0.8)
44.5×3.7+6.3×44.5 展开
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1.25×0.25×8×40
=(1.25×8)×(0.25×40)
=10×10
=100
5.7×9.9
=5.7×(10-0.1)
=5.7×10-5.7×0.1
=57-0.57
=56.43
0.34×10.1
=0.34×(10+0.1)
=0.34×10+0.34×0.1
=3.4+0.034
=3.434
12.5×(10+0.8)
=12.5×10+12.5×0.8
=125+10
=135
44.5×3.7+6.3×44.5
=44.5×(3.7+6.3)
=44.5×10
=445
=(1.25×8)×(0.25×40)
=10×10
=100
5.7×9.9
=5.7×(10-0.1)
=5.7×10-5.7×0.1
=57-0.57
=56.43
0.34×10.1
=0.34×(10+0.1)
=0.34×10+0.34×0.1
=3.4+0.034
=3.434
12.5×(10+0.8)
=12.5×10+12.5×0.8
=125+10
=135
44.5×3.7+6.3×44.5
=44.5×(3.7+6.3)
=44.5×10
=445
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1.25X0.25×8×40
=(1.25x8)X(0.25X40)
=10Xl
=10
5.7x9.9
=5.7x(10-0.1)
=5.7X10-5.7X0.1
=57一0.57
=56.43
0.34X10.1
=0.34X10+0.34X0.1
=3.4+0.034
=3.434
12.5x(10+0.8)
=12.5X10+12.5x0.8
=125+10
=135
44.5X3.7+6.3x44.5
=44.5x(3.7+6.3)
=44.5x10
=445
=(1.25x8)X(0.25X40)
=10Xl
=10
5.7x9.9
=5.7x(10-0.1)
=5.7X10-5.7X0.1
=57一0.57
=56.43
0.34X10.1
=0.34X10+0.34X0.1
=3.4+0.034
=3.434
12.5x(10+0.8)
=12.5X10+12.5x0.8
=125+10
=135
44.5X3.7+6.3x44.5
=44.5x(3.7+6.3)
=44.5x10
=445
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追答
采纳一下，好吗？谢谢了
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