计算下面各题,能简算的要简算.1.29+3.7+2.71+6.3 3.75÷[0.3×(1.34-0.84)] 7.2×7.2+7.2×2.8
计算下面各题,能简算的要简算.1.29+3.7+2.71+6.33.75÷[0.3×(1.34-0.84)]7.2×7.2+7.2×2.80.25×0.8×0.125×4...
计算下面各题,能简算的要简算.1.29+3.7+2.71+6.3 3.75÷[0.3×(1.34-0.84)] 7.2×7.2+7.2×2.8 0.25×0.8×0.125×4 25×10.8×0.04 15.32-1.8×5-3.46.
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(1)1.29+3.7+2.71+6.3,
=(1.29+2.71)+(3.7+6.3),
=4+10,
=14;
(2)3.75÷[0.3×(1.34-0.84)],
=3.75÷[0.3×0.5],
=3.75÷0.15,
=25;
(3)7.2×7.2+7.2×2.8,
=7.2×(7.2+2.8),
=7.2×10,
=72;
(4)0.25×0.8×0.125×4,
=(0.25×4)×(0.125×0.8),
=1×0.1,
=0.1;
(5)25×10.8×0.04,
=25×0.04×10.8,
=1×10.8,
=10.8;
(6)15.32-1.8×5-3.46,
=15.32-9-3.46,
=6.32-3.46,
=2.86.
=(1.29+2.71)+(3.7+6.3),
=4+10,
=14;
(2)3.75÷[0.3×(1.34-0.84)],
=3.75÷[0.3×0.5],
=3.75÷0.15,
=25;
(3)7.2×7.2+7.2×2.8,
=7.2×(7.2+2.8),
=7.2×10,
=72;
(4)0.25×0.8×0.125×4,
=(0.25×4)×(0.125×0.8),
=1×0.1,
=0.1;
(5)25×10.8×0.04,
=25×0.04×10.8,
=1×10.8,
=10.8;
(6)15.32-1.8×5-3.46,
=15.32-9-3.46,
=6.32-3.46,
=2.86.
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