Question

(1)3..2X÷2-4.2X÷3=9.8 递等式计算(能简则简) (2) (30.4-9.85)×1.06÷0.01

Answer 1

(1)1.6x-1.4x=9.8

0.2x=9.8

x=9.8÷0.2

x=49

(2)(30.4-9.85)×1.06÷0.01

=20.55÷0.01×1.06

=2055×1.06

=2178.3

(3)0.99×1.02

=(1-0.01)×(1+0.02)

=1+0.02-0.01-0.0002

=1.0098