脱式计算. 8.82×15-100 15.8-[7/18]+14.2-[11/18] 21.6-0.8×4÷0.8×4
1个回答

(1)8.82×15-100

=132.3-100

=32.3;

(2)15.8-[7/18]+14.2-[11/18]

=(15.8+14.2)-([7/18]+[11/18])

=30-1

=29;

(3)21.6-0.8×4÷0.8×4

=21.6-3.2÷0.8×4

=21.6-4×4

=21.6-16

=5.6;

(4)3[3/5]×3.7+3.6+5.3×3[3/5]

=3[3/5]×3.7+3[3/5]×1+5.3×3[3/5]

=3[3/5]×(3.7+1+5.3)

=3[3/5]×10

=36;

(5)2.5×4.4

=2.5×(4+0.4)

=2.5×4+2.5×0.4

=10+1

=11;

(6)(1.5+2[2/3])÷3.75-[2/3]

=[25/6]÷3.75-[2/3]

=[25/6]×[4/15]-[2/3]

=[10/9]-[2/3]

=[4/9].