脱式计算.(能简算的要简算)(1)1.25×8.37×0.8 (2)(9-2.35)×0.64 (3)0.25×32×...
脱式计算.(能简算的要简算)(1)1.25×8.37×0.8(2)(9-2.35)×0.64(3)0.25×32×12.5(4)0.15×1999+0.15(5)0.37...
脱式计算.(能简算的要简算)(1)1.25×8.37×0.8 (2)(9-2.35)×0.64 (3)0.25×32×12.5(4)0.15×1999+0.15 (5)0.37×1.4-0.4×0.37 (6)8.7×9.9.
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(1)1.25×8.37×0.8
=1.25×0.8×8.37,
=1×8.37,
=8.37;
(2)(9-2.35)×0.64
=6.65×0.64,
=4.256;
(3)0.25×32×12.5
=(0.25×4)×(8×1.25),
=1×10,
=10;
(4)0.15×1999+0.15
=(1+1999)×0.15,
=2000×0.15,
=300;
(5)0.37×1.4-0.4×0.37
=(1.4-0.4)×0.37,
=1×0.37,
=0.37;
(6)8.7×9.9
=8.7×(10-0.1),
=8.7×10-8.7×0.1,
=87-0.87,
=86.13.
=1.25×0.8×8.37,
=1×8.37,
=8.37;
(2)(9-2.35)×0.64
=6.65×0.64,
=4.256;
(3)0.25×32×12.5
=(0.25×4)×(8×1.25),
=1×10,
=10;
(4)0.15×1999+0.15
=(1+1999)×0.15,
=2000×0.15,
=300;
(5)0.37×1.4-0.4×0.37
=(1.4-0.4)×0.37,
=1×0.37,
=0.37;
(6)8.7×9.9
=8.7×(10-0.1),
=8.7×10-8.7×0.1,
=87-0.87,
=86.13.
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