Question

第一题解方程 25％X+3=三分之二x6 第二题用简便方法计算 五分之九x25％+2.2—0.25

Answer 1

25％X+3=三分之二x6

0.25X=4-3

0.25X=1

X=1÷0.25

X=4

五分之九x25％+2.2—0.25

=1.8×0.25-0.25+2.2

=(1.8-1)×0.25+2.2

=0.8×0.25+2.2

=0.2+2.2

=2.4