脱式计算,能简算的要简算(1)8.65-3.7+1.35-6.3 (2)[2.1+3.61÷(7...
脱式计算,能简算的要简算(1)8.65-3.7+1.35-6.3(2)[2.1+3.61÷(7.2-5.3)]×30(3)1.2+36÷[1.44×(0.1-0.05)]...
脱式计算,能简算的要简算(1)8.65-3.7+1.35-6.3 (2)[2.1+3.61÷(7.2-5.3)]×30(3)1.2+36÷[1.44×(0.1-0.05)](4)(16.5×3+3×7.5)÷6.
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(1)8.65-3.7+1.35-6.3
=(8.65+1.35)-(3.7+6.3),
=10-10,
=0;
(2)[2.1+3.61÷(7.2-5.3)]×30
=[2.1+3.61÷1.9]×30,
=[2.1+1.9]×30,
=4×30,
=120;
(3)1.2+36÷[1.44×(0.1-0.05)]
=1.2+36÷[1.44×0.05],
=1.2+36÷0.072,
=1.2+500,
=501.2;
(4)(16.5×3+3×7.5)÷6
=[(16.5+7.5)×3]÷6,
=24×3÷6,
=72÷6,
=12.
=(8.65+1.35)-(3.7+6.3),
=10-10,
=0;
(2)[2.1+3.61÷(7.2-5.3)]×30
=[2.1+3.61÷1.9]×30,
=[2.1+1.9]×30,
=4×30,
=120;
(3)1.2+36÷[1.44×(0.1-0.05)]
=1.2+36÷[1.44×0.05],
=1.2+36÷0.072,
=1.2+500,
=501.2;
(4)(16.5×3+3×7.5)÷6
=[(16.5+7.5)×3]÷6,
=24×3÷6,
=72÷6,
=12.
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