0.76*52+4.8*7.6简便计算 78.1*54.3+45.45*78.1+78.2/4简便计算

0.76×52+4.8×7.6=7.6×(5.2+4.8)=7.6×10=7678.1×54.3+45.45×78.1+78.2÷4=78.1×54.3+45.45×78.1+(78.1+0.1)÷4=78.1×54.3+45.45×78.1+78.1÷4+0.1÷4=78.1×(54.3+45.45+1/4)+1/40=78.1×100+0.025=7810.02...